Action does not work on AWS CodeBuild self-hosted Github runners when `helm` is invoked from Python script

[corneliusroemer]

I've tried to use this action on an AWS CodeBuild self-hosted Github runner.

It works like this:

- name: Test helm template
        uses: WyriHaximus/github-action-helm3@v4
        with:
          exec: helm template does-not-matter ./kubernetes/xyz > defaultTemplate.yaml

but not when helm is invoked by a python script:

 - name: Deploy with helm
        uses: WyriHaximus/github-action-helm3@v4
        with:
          exec: ./deploy.py --verbose helm --branch ${{ github.ref_name }} --sha ${{ github.sha }}

this fails with:

Traceback (most recent call last):
  File "/codebuild/output/src3554363593/src/actions-runner/_work/x/x/./deploy.py", line 225, in <module>
    main()
  File "/codebuild/output/src3554363593/src/actions-runner/_work/x/x/./deploy.py", line 79, in main
    handle_helm()
  File "/codebuild/output/src3554363593/src/actions-runner/_work/x/x/./deploy.py", line [16](https://github.com/x-project/x/actions/runs/8853717181/job/24315537008#step:7:17)6, in handle_helm
    run_command(parameters)
  File "/codebuild/output/src3554363593/src/actions-runner/_work/x/x/./deploy.py", line 69, in run_command
    output =  subprocess.run(command, **kwargs)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/root/.pyenv/versions/3.11.8/lib/python3.11/subprocess.py", line 548, in run
    with Popen(*popenargs, **kwargs) as process:
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/root/.pyenv/versions/3.11.8/lib/python3.11/subprocess.py", line 1026, in __init__
    self._execute_child(args, executable, preexec_fn, close_fds,
  File "/root/.pyenv/versions/3.11.8/lib/python3.11/subprocess.py", line [19](https://github.com/x-project/x/actions/runs/8853717181/job/24315537008#step:7:20)53, in _execute_child
    raise child_exception_type(errno_num, err_msg, err_filename)
FileNotFoundError: [Errno 2] No such file or directory: 'helm'

Invoking helm from a Python script works fine using the normal Github actions. Not sure why it doesn't on AWS runners.