Bug: Build error when using docker build secrets

### Description:
My goal is to build my images outside sam and use sam only for debugging using the AWS Toolkit in Pycharm.
When running the AWS Toolkit debug configuration in Pycharm the `sam build` command is ran and fails.

Whenever I use a `RUN --mount=type=secret` in my Dockerfile I get the build error.

This is the error:
```shell
Error: unexpected key 'env' in 'env=PIP_INDEX_URL'
```

This is the part from the Dockerfile:
```Dockerfile
RUN --mount=type=secret,id=PIP_INDEX_URL,env=PIP_INDEX_URL \
pip install -r requirements.codeartifact.txt
```

If I remove this part from the Dockerfile the error is solved.

Regardess of sam, I get the same error when I remove this line from my Dockerfile:
```Dockerfile
# syntax=docker/dockerfile:1
```

### Observed result:
```shell
(base) PS C:\Users\roya\PycharmProjects\unigen_pipeline> sam.cmd build SendPipelineResultToCaller --use-container --debug
2024-09-28 19:13:21,921 | Config file location: C:\Users\roya\PycharmProjects\unigen_pipeline\samconfig.toml
2024-09-28 19:13:21,923 | Loading configuration values from [default.['build'].parameters] (env.command_name.section) in config file at 'C:\Users\roya\PycharmProjects\unigen_pipeline\samconfig.toml'...
2024-09-28 19:13:21,925 | Configuration values successfully loaded.
2024-09-28 19:13:21,926 | Configuration values are: {'region': 'us-east-1', 'parameter_overrides': ['AwsAccessKeyId=[reducted]', 'AwsSecretAccessKey=[reducted]',
'AwsSessionToken=[reducted]']}
2024-09-28 19:13:21,932 | Using SAM Template at C:\Users\roya\PycharmProjects\unigen_pipeline\template.yaml
2024-09-28 19:13:21,949 | Using config file: samconfig.toml, config environment: default
2024-09-28 19:13:21,950 | Expand command line arguments to:
2024-09-28 19:13:21,950 | --template_file=C:\Users\roya\PycharmProjects\unigen_pipeline\template.yaml --use_container --resource_logical_id=SendPipelineResultToCaller --mount_with=READ --build_dir=.aws-sam\build --cache_dir=.aws-sam\cache
--parameter_overrides={'AwsAccessKeyId': '[reducted]', 'AwsSecretAccessKey': '[reducted]', 'AwsSessionToken':
'[reducted]'}
2024-09-28 19:13:22,015 | 'build' command is called
2024-09-28 19:13:22,016 | Starting Build inside a container
2024-09-28 19:13:22,022 | Collected default values for parameters: {'AwsAccessKeyId': '', 'AwsSecretAccessKey': '', 'AwsSessionToken': ''}
2024-09-28 19:13:22,037 | There is no customer defined id or cdk path defined for resource ReadSqs, so we will use the resource logical id as the resource id
2024-09-28 19:13:22,038 | There is no customer defined id or cdk path defined for resource SendPipelineResultToCaller, so we will use the resource logical id as the resource id
2024-09-28 19:13:22,038 | There is no customer defined id or cdk path defined for resource GetSampleLocations, so we will use the resource logical id as the resource id
2024-09-28 19:13:22,039 | There is no customer defined id or cdk path defined for resource ValidateStateMachineInput, so we will use the resource logical id as the resource id
2024-09-28 19:13:22,039 | There is no customer defined id or cdk path defined for resource SfLambda, so we will use the resource logical id as the resource id
2024-09-28 19:13:22,040 | There is no customer defined id or cdk path defined for resource LinkDatasetToStudy, so we will use the resource logical id as the resource id
2024-09-28 19:13:22,041 | There is no customer defined id or cdk path defined for resource AddCellCount, so we will use the resource logical id as the resource id
2024-09-28 19:13:22,041 | 0 stacks found in the template
2024-09-28 19:13:22,042 | Collected default values for parameters: {'AwsAccessKeyId': '', 'AwsSecretAccessKey': '', 'AwsSessionToken': ''}
2024-09-28 19:13:22,052 | There is no customer defined id or cdk path defined for resource ReadSqs, so we will use the resource logical id as the resource id
2024-09-28 19:13:22,053 | There is no customer defined id or cdk path defined for resource SendPipelineResultToCaller, so we will use the resource logical id as the resource id
2024-09-28 19:13:22,053 | There is no customer defined id or cdk path defined for resource GetSampleLocations, so we will use the resource logical id as the resource id
2024-09-28 19:13:22,054 | There is no customer defined id or cdk path defined for resource ValidateStateMachineInput, so we will use the resource logical id as the resource id
2024-09-28 19:13:22,054 | There is no customer defined id or cdk path defined for resource SfLambda, so we will use the resource logical id as the resource id
2024-09-28 19:13:22,055 | There is no customer defined id or cdk path defined for resource LinkDatasetToStudy, so we will use the resource logical id as the resource id
2024-09-28 19:13:22,055 | There is no customer defined id or cdk path defined for resource AddCellCount, so we will use the resource logical id as the resource id
2024-09-28 19:13:22,056 | 7 resources found in the stack
2024-09-28 19:13:22,057 | Found Serverless function with name='ReadSqs' and ImageUri='readsqs'
2024-09-28 19:13:22,058 | --base-dir is not presented, adjusting uri ./functions/read_sqs relative to C:\Users\roya\PycharmProjects\unigen_pipeline\template.yaml
2024-09-28 19:13:22,058 | --base-dir is not presented, adjusting uri . relative to C:\Users\roya\PycharmProjects\unigen_pipeline\template.yaml
2024-09-28 19:13:22,059 | Skip building pre-built function: ReadSqs
2024-09-28 19:13:22,060 | Found Serverless function with name='SendPipelineResultToCaller' and ImageUri='sendpipelineresulttocaller'
2024-09-28 19:13:22,060 | --base-dir is not presented, adjusting uri ./functions/send_pipeline_result_to_caller relative to C:\Users\roya\PycharmProjects\unigen_pipeline\template.yaml
2024-09-28 19:13:22,061 | --base-dir is not presented, adjusting uri . relative to C:\Users\roya\PycharmProjects\unigen_pipeline\template.yaml
2024-09-28 19:13:22,061 | Skip building pre-built function: SendPipelineResultToCaller
2024-09-28 19:13:22,062 | Found Serverless function with name='GetSampleLocations' and ImageUri='getsamplelocations'
2024-09-28 19:13:22,062 | --base-dir is not presented, adjusting uri ./functions/get_sample_locations relative to C:\Users\roya\PycharmProjects\unigen_pipeline\template.yaml
2024-09-28 19:13:22,063 | --base-dir is not presented, adjusting uri . relative to C:\Users\roya\PycharmProjects\unigen_pipeline\template.yaml
2024-09-28 19:13:22,063 | Skip building pre-built function: GetSampleLocations
2024-09-28 19:13:22,064 | Found Serverless function with name='ValidateStateMachineInput' and ImageUri='validatestatemachineinput'
2024-09-28 19:13:22,064 | --base-dir is not presented, adjusting uri ./functions/validate_state_machine_input relative to C:\Users\roya\PycharmProjects\unigen_pipeline\template.yaml
2024-09-28 19:13:22,065 | --base-dir is not presented, adjusting uri . relative to C:\Users\roya\PycharmProjects\unigen_pipeline\template.yaml
2024-09-28 19:13:22,065 | Skip building pre-built function: ValidateStateMachineInput
2024-09-28 19:13:22,066 | Found Serverless function with name='SfLambda' and ImageUri='sflambda'
2024-09-28 19:13:22,066 | --base-dir is not presented, adjusting uri ./functions/sf_lambda relative to C:\Users\roya\PycharmProjects\unigen_pipeline\template.yaml
2024-09-28 19:13:22,067 | --base-dir is not presented, adjusting uri . relative to C:\Users\roya\PycharmProjects\unigen_pipeline\template.yaml
2024-09-28 19:13:22,067 | Skip building pre-built function: SfLambda
2024-09-28 19:13:22,068 | Found Serverless function with name='LinkDatasetToStudy' and ImageUri='linkdatasettostudy'
2024-09-28 19:13:22,068 | --base-dir is not presented, adjusting uri ./functions/link_dataset_to_study relative to C:\Users\roya\PycharmProjects\unigen_pipeline\template.yaml
2024-09-28 19:13:22,069 | --base-dir is not presented, adjusting uri . relative to C:\Users\roya\PycharmProjects\unigen_pipeline\template.yaml
2024-09-28 19:13:22,070 | Skip building pre-built function: LinkDatasetToStudy
2024-09-28 19:13:22,070 | Found Serverless function with name='AddCellCount' and ImageUri='addcellcount'
2024-09-28 19:13:22,071 | --base-dir is not presented, adjusting uri ./functions/add_cell_counts relative to C:\Users\roya\PycharmProjects\unigen_pipeline\template.yaml
2024-09-28 19:13:22,071 | --base-dir is not presented, adjusting uri . relative to C:\Users\roya\PycharmProjects\unigen_pipeline\template.yaml
2024-09-28 19:13:22,072 | Skip building pre-built function: AddCellCount
2024-09-28 19:13:22,077 | 7 resources found in the stack
2024-09-28 19:13:22,078 | Found Serverless function with name='ReadSqs' and ImageUri='readsqs'
2024-09-28 19:13:22,079 | Skip building pre-built function: ReadSqs
2024-09-28 19:13:22,080 | Found Serverless function with name='SendPipelineResultToCaller' and ImageUri='sendpipelineresulttocaller'
2024-09-28 19:13:22,080 | Skip building pre-built function: SendPipelineResultToCaller
2024-09-28 19:13:22,081 | Found Serverless function with name='GetSampleLocations' and ImageUri='getsamplelocations'
2024-09-28 19:13:22,081 | Skip building pre-built function: GetSampleLocations
2024-09-28 19:13:22,082 | Found Serverless function with name='ValidateStateMachineInput' and ImageUri='validatestatemachineinput'
2024-09-28 19:13:22,082 | Skip building pre-built function: ValidateStateMachineInput
2024-09-28 19:13:22,083 | Found Serverless function with name='SfLambda' and ImageUri='sflambda'
2024-09-28 19:13:22,084 | Skip building pre-built function: SfLambda
2024-09-28 19:13:22,084 | Found Serverless function with name='LinkDatasetToStudy' and ImageUri='linkdatasettostudy'
2024-09-28 19:13:22,085 | Skip building pre-built function: LinkDatasetToStudy
2024-09-28 19:13:22,086 | Found Serverless function with name='AddCellCount' and ImageUri='addcellcount'
2024-09-28 19:13:22,086 | Skip building pre-built function: AddCellCount
2024-09-28 19:13:22,087 | Error occurred while trying to track an event: Event 'BuildFunctionRuntime' does not accept value 'None'.
2024-09-28 19:13:22,088 | Instantiating build definitions
2024-09-28 19:13:22,089 | No previous build graph found, generating new one
2024-09-28 19:13:22,089 | Unique function build definition found, adding as new (Function Build Definition: BuildDefinition(None, C:\Users\roya\PycharmProjects\unigen_pipeline, Image, , 817b3ea2-2429-4835-adbb-a19b333d4211, {'SkipBuild': True, 'Dockerfile':
'Dockerfile', 'DockerContext': 'C:\\Users\\roya\\PycharmProjects\\unigen_pipeline\\functions\\send_pipeline_result_to_caller'}, {}, x86_64, []), Function: Function(function_id='SendPipelineResultToCaller', name='SendPipelineResultToCaller',
functionname='SendPipelineResultToCaller', runtime=None, memory=2048, timeout=30, handler=None, imageuri='sendpipelineresulttocaller', packagetype='Image', imageconfig=None, codeuri='C:\\Users\\roya\\PycharmProjects\\unigen_pipeline', environment={'Variables':
{'BUCKET_NAME': ''}}, rolearn=None, layers=[], events=None, metadata={'SkipBuild': True, 'Dockerfile': 'Dockerfile', 'DockerContext': 'C:\\Users\\roya\\PycharmProjects\\unigen_pipeline\\functions\\send_pipeline_result_to_caller', 'SamResourceId':
'SendPipelineResultToCaller'}, inlinecode=None, codesign_config_arn=None, architectures=None, function_url_config=None, function_build_info=,
stack_path='', runtime_management_config=None, logging_config=None))
2024-09-28 19:13:22,092 | Building codeuri: C:\Users\roya\PycharmProjects\unigen_pipeline runtime: None metadata: {'SkipBuild': True, 'Dockerfile': 'Dockerfile', 'DockerContext':
'C:\\Users\\roya\\PycharmProjects\\unigen_pipeline\\functions\\send_pipeline_result_to_caller'} architecture: x86_64 functions: SendPipelineResultToCaller
2024-09-28 19:13:22,093 | Building to following folder C:\Users\roya\PycharmProjects\unigen_pipeline\.aws-sam\build\SendPipelineResultToCaller
2024-09-28 19:13:22,093 | Building image for SendPipelineResultToCaller function
2024-09-28 19:13:22,099 | Setting DockerBuildArgs: {} for SendPipelineResultToCaller function
2024-09-28 19:13:22,274 | Failed building function SendPipelineResultToCaller

Build Failed
2024-09-28 19:13:22,284 | Telemetry endpoint configured to be https://aws-serverless-tools-telemetry.us-west-2.amazonaws.com/metrics
2024-09-28 19:13:22,534 | Telemetry endpoint configured to be https://aws-serverless-tools-telemetry.us-west-2.amazonaws.com/metrics
2024-09-28 19:13:22,534 | Sending Telemetry: {'metrics': [{'commandRun': {'requestId': 'daa61946-e7ce-47cb-8ccb-830d3fec1e60', 'installationId': '12857e84-3346-496c-987c-3c885abc8da7', 'sessionId': '97bd7ff3-f59d-43ca-a884-b31eeb59a267', 'executionEnvironment': 'CLI',
'ci': False, 'pyversion': '3.11.8', 'samcliVersion': '1.115.0', 'awsProfileProvided': False, 'debugFlagProvided': True, 'region': 'us-east-1', 'commandName': 'sam build', 'metricSpecificAttributes': {'projectType': 'CFN', 'gitOrigin':
'b434c6605bc3c7f9b872ba7661045d74b6075801499be400267f904460194dfb', 'projectName': 'cd7d3ce40c6d284416e2dd8eaf5ea424d5c71abac7e4ccc153d6f8a540b3df6f', 'initialCommit': '4aa3f951373a0e613daf16947fff86ebb08b9a47119e278a9f6b6c3b6a121e9e'}, 'duration': 335, 'exitReason':
'DockerBuildFailed', 'exitCode': 1}}]}
2024-09-28 19:13:22,535 | Unable to find Click Context for getting session_id.
2024-09-28 19:13:22,538 | Sending Telemetry: {'metrics': [{'events': {'requestId': 'e45cf212-76cd-456e-b72a-03e53086cf3f', 'installationId': '12857e84-3346-496c-987c-3c885abc8da7', 'sessionId': '97bd7ff3-f59d-43ca-a884-b31eeb59a267', 'executionEnvironment': 'CLI', 'ci':
False, 'pyversion': '3.11.8', 'samcliVersion': '1.115.0', 'commandName': 'sam build', 'metricSpecificAttributes': {'events': [{'event_name': 'SamConfigFileExtension', 'event_value': '.toml', 'thread_id': '6b7b23808a894dd99e89f1b74e8946ba', 'time_stamp': '2024-09-28
16:13:21.921', 'exception_name': None}, {'event_name': 'SamConfigFileExtension', 'event_value': '.toml', 'thread_id': '66131a6249d54b50a6e9aeafde8b8a2b', 'time_stamp': '2024-09-28 16:13:21.949', 'exception_name': None}]}}}]}
2024-09-28 19:13:23,430 | HTTPSConnectionPool(host='aws-serverless-tools-telemetry.us-west-2.amazonaws.com', port=443): Read timed out. (read timeout=0.1)
2024-09-28 19:13:23,433 | HTTPSConnectionPool(host='aws-serverless-tools-telemetry.us-west-2.amazonaws.com', port=443): Read timed out. (read timeout=0.1)
Error: unexpected key 'env' in 'env=PIP_INDEX_URL'
```

### Additional environment details (Ex: Windows, Mac, Amazon Linux etc)

1. OS: Windows 11
2. `sam --version`: SAM CLI, version 1.115.0
3. AWS region: us-east-1

```
{
"version": "1.115.0",
"system": {
"python": "3.11.8",
"os": "Windows-10-10.0.22631-SP0"
},
"additional_dependencies": {
"docker_engine": "27.2.0",
"aws_cdk": "Not available",
"terraform": "1.8.1"
},
"available_beta_feature_env_vars": [
"SAM_CLI_BETA_FEATURES",
"SAM_CLI_BETA_BUILD_PERFORMANCE",
"SAM_CLI_BETA_TERRAFORM_SUPPORT",
"SAM_CLI_BETA_RUST_CARGO_LAMBDA"
]
}
```