[BUG] CI/CD `external_contributions_tests` does not work as expected

[davidberenstein1957]

Describe the bug

There are two related issues:

• Incorrect User Role Detection: Some contributors (e.g., @davidberenstein1957, @nifleisch) are not recognized as OWNER, MEMBER, or COLLABORATOR even though we are part of the team.
• Tests Not Running Against PR Code: The external_contributions_tests suite does not seem to test the actual code introduced in the PR. It runs against a different codebase/version, possibly from a cached or default source retrieved from the --extra-index.

A flow of what happened:

• @nifleisch opened PR #92. It passed CI/CD checks, but the tests seem to be validating unrelated code.
• PR #90 passed locally and on CI initially.
• After merging feat: add fastercache and pab #92, docs: general structure refactor #90 started failing on CI despite unchanged code and successful local test runs.
• Indicates external_contributions_tests may not run against the true diff in the PR branch.

What I did

The author_association field in GitHub's API seems unreliable or affected by:

• Team visibility settings (private vs. public)
• Whether a contributor is added directly to the repo
• Potential GitHub caching issues

We tested changing visibility and adding direct contributor access (thanks @sharpenb) and re-running the test, but no resolution yet. Some values may be cached here too.

No luck so far, perhaps some values are cached.

Expected behavior

• Contributors should be accurately identified (e.g., as MEMBER).
• external_contributions_tests should always test the code proposed in the PR branch, not some default or cached source.

1. Improve Role Detection Logic

• Use GitHub API fallback methods:
• Consider logging or debugging role recognition in CI to catch misclassification.

2. Ensure PR Code is Tested

• Confirm that external_contributions_tests uses checkout@v3 or newer with ref: ${{ github.event.pull_request.head.ref }}.
• Avoid dependency resolution via --extra-index that might point to outdated packages.

Screenshots

Environment

• pruna version:
• python version:
• Operating System:

Additional context