fix(ci): fix ready workflow

[Christian Bromann (christian-bromann)]

The issue is that this workflow fails when the pull request comes from a fork. When a PR originates from a fork, the GITHUB_TOKEN has restricted permissions and cannot write labels to the base repository - this is a GitHub security feature.

The fix adds a new condition: github.event.pull_request.head.repo.full_name == github.repository

This checks if the PR's source repository matches the base repository. Now:

• PRs from the main repo's branches → condition passes, label gets added ✓
• PRs from forks → condition fails, job is skipped gracefully (no error) ✓

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Latest commit: c81d384

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