[BUG] Different behaviour between openapi-generator-cli npm and docker distributions for the --generator-key arg

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?
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Description

I have got a typescript angular project that is using the @openapitools/openapi-generator-cli npm package to generate the openapi code locally on the dev machine. I have got an openapitools.json file that contains my generation config, which I then invoke with openapi-generator-cli generate --generator-key <my-key> in the scripts section of the package.json.

To do the same in the pipeline I was evaluating the openapitools/openapi-generator-cli docker image to avoid having to build a custom image that bundles node and java (and mvn,jq and curl when using the script).
However when running the same command that is working fine with the npm package, there is an [error] Found unexpected parameters: [--generator-key, <my-key>]. It seems like the docker version is requiring the -i arg and is not recognising the --generator-key.

openapi-generator version

6.6.0

OpenAPI declaration file content or url

Not important for this issue.

Generation Details

• openapi-generator-cli npm package
• openapi-generator-cli docker image

openapitools.json:

{
  "$schema": "./node_modules/@openapitools/openapi-generator-cli/config.schema.json",
  "spaces": 2,
  "generator-cli": {
    "version": "6.6.0",
    "generators": {
      "v3.0": {
        "generatorName": "typescript-angular",
        "inputSpec": "openapi/input/api.yaml",
        "output": "openapi/output",
        "additionalProperties": {
          "ngVersion": "12.1.0",
          "modelFileSuffix": ".model",
          "fileNaming": "camelCase",
          "enumPropertyNaming": "UPPERCASE"
        }
      }
    }
  }
}

Steps to reproduce

1. Generate a new angular project
2. Install the openapi-generator-cli via npm: npm install @openapitools/openapi-generator-cli -D
3. Add a openapi/input/api.yaml file with some openapi definition to the project
4. Add the openapitools.json as described above to the project
5. Run npx openapi-generator-cli generate --generator-key v3.0 and observe the successful generation
6. Run docker run --rm -v ${PWD}:/local openapitools/openapi-generator-cli generate --generator-key v3.0 as described in the docker instructions and observe the [error] Found unexpected parameters: [--generator-key, v3.0] error

Related issues/PRs

Suggest a fix

I would expect the same feature set from the npm and docker distributions since both share the same name.

Start by reproducing the two commands from the issue with the documented npm package and Docker image at version 6.6.0, using the supplied openapitools.json and generator key. Compare how each distribution handles the generate --generator-key entry point; done means the Docker command accepts the same option and produces equivalent generation behavior.