The pythonLocation environment variable is shown as invalid access in this context

[Julfried]

Describe the bug

When using the pythonLocation environment variable set by the actions/setup-python action, this extension reports "Context access might be invalid" even though it is a valid environment variable documented in the official setup-python action.

To Reproduce

Steps to reproduce the behavior:

1. With this workflow:

   name: Test Workflow
   
   on:
     workflow_dispatch:
   
   jobs:
     test:
       runs-on: ubuntu-latest
       steps:
         - uses: actions/checkout@v4
         - uses: actions/setup-python@v5
           with:
             python-version: '3.12'
         - name: Cache pip
           uses: actions/cache@v4
           with:
             path: ${{ env.pythonLocation }}/.cache/pip
             key: python-${{ hashFiles('setup.py', 'pyproject.toml') }}

2. Open the "Problems" panel in VS Code.

3. See the error:

   Context access might be invalid: pythonLocation
   

Expected behavior

The pythonLocation environment variable, which is documented and valid when using actions/setup-python, should be recognized properly by this extension.

Screenshots

If applicable, include screenshots of the warning in the Problems panel.

Extension Version

vX.Y.Z

Additional context

• Official documentation for the pythonLocation variable: [setup-python environment variables](https://github.com/actions/setup-python#outputs-and-environment-variables).
• This warning is a false positive, as the workflow executes without issues and the variable is set correctly.
• Is this a bug or a limitation of the extension?

---

[muzimuzhi]

In my understanding, currently vscode-github-actions only lint inputs and outputs recorded in action.yml of an action (see the action.yml of setup-python action), hence it has no knowledge about what environment variables and dynamic outputs are set.

[Julfried]

Thanks for clarification, this limitation makes sense. I found a workaround to address this issue: explicitly setting pythonLocation as a workflow environment variable within the env block for steps that use it:

- name: Cache pip
  id: cache-pip
  uses: actions/cache@v4
  with:
    path: ${{ env.pythonLocation }}
    key: ${{ env.pythonLocation }}-${{ hashFiles('setup.py', 'pyproject.toml') }}
  env:
    pythonLocation: ${{ env.pythonLocation }}