[Bugfix] set permissions to compatibility github action

[RektPunk]

Fixes to #12

Note on GitHub Action Failure: This is expected for now because the current base branch lacks the necessary permissions for Fork PRs. I have included the fix in this PR (permissions block), so it will work correctly starting from the next PR after this one is merged.

Summary by Sourcery

CI:

• Grant the compatibility workflow job read access to repository contents and write access to pull requests.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Configures explicit GitHub Actions permissions for the compatibility workflow’s final job so it can safely read repository contents and write to pull requests, aligning with GitHub’s more restrictive default permissions model.

File-Level Changes

Change	Details	Files
Add explicit permissions to the compatibility workflow’s final job so it can read repository contents and update pull requests.	Introduce a permissions block at the job level for the post-compatibility-test job. Grant read access to repository contents needed by the job steps. Grant write access to pull requests, enabling the job to comment on or otherwise modify PRs.	.github/workflows/compatibility.yml

Possibly linked issues

• 403 Forbidden "Resource not accessible by integration" when posting PR comment action #12: The PR adds contents read and pull-requests write permissions, resolving the 403 ‘Resource not accessible by integration’ error.

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