(@aws-cdk/aws-gamelift-alpha): Build Construct uploading files with 0 bytes

### Describe the bug

SIM - V1081677033

Customer is using the construct Build[1] but however , the stack is successful but it uploads the file with 0 bytes. When we create the build via the CLI , it was able to successfully build and we were able to see the build file size with actual size. Below is the sample code snippet

```
const b1 = new gf.Build(this,'samplebuild',{
buildName: 'sample-build',
operatingSystem: gf.OperatingSystem.AMAZON_LINUX_2,
content: gf.Content.fromAsset(path.join(__dirname, 'docker')),
buildVersion: '1.0.0',

})
```
CX tried to upload Gamelift builds include:

Uploading a folder directly from my PC using Content.from_asset
Uploading a zip file directly from my PC using Content.from_asset
Uploading a zip file from an S3 bucket using Content.from_bucket

All of these result in a build being created in Gamelift of 0 size.

[1] https://docs.aws.amazon.com/cdk/api/v2/docs/@aws-cdk_aws-gamelift-alpha.Build.html#rolespan-classapi-icon-api-icon-experimental-titlethis-api-element-is-experimental-it-may-change-without-noticespan
[2] https://github.com/aws/aws-cdk/blob/main/packages/%40aws-cdk/aws-gamelift-alpha/lib/build.ts

### Expected Behavior

It should be uploaded successfully

### Current Behavior

Using fromAsset(), data is not uploaded

### Reproduction Steps

```
const b1 = new gf.Build(this,'samplebuild',{
buildName: 'sample-build',
operatingSystem: gf.OperatingSystem.AMAZON_LINUX_2,
content: gf.Content.fromAsset(path.join(__dirname, 'docker')),
buildVersion: '1.0.0',

})
```

### Possible Solution

_No response_

### Additional Information/Context

_No response_

### CDK CLI Version

2.103.0 (build d0d7547)

### Framework Version

_No response_

### Node.js Version

v18

### OS

Mac

### Language

TypeScript

### Language Version

_No response_

### Other information

_No response_

Start with packages/@aws-cdk/aws-gamelift-alpha/lib/build.ts and reproduce the issue using the provided TypeScript example with Content.fromAsset(). Compare the construct's upload behavior with the CLI and the fromBucket cases; done means a GameLift build contains the supplied files at their actual size.

Written by the indexing model from the issue text.