[Roxen-AS]

Explanation

Summary

Resolve the pull request head commit through refs/pull/<number>/head in both changelog checks so that they resolve properly for pull requests opened from a fork.

Problem

Both changelog checks assume the pull request head branch exists under origin/ in MetaMask/core. That assumption fails for pull requests opened from a fork repository, causing both checks to fail before running any changelog validation:

• In Validate changelog diffs (check-merge-queue-changelogs), git merge-base "origin/$BASE_REF" "origin/$PR_BRANCH" fails with fatal: Not a valid object name origin/....
• In Check changelog (changelog-check.yml), actions/checkout cannot locate github.head_ref in github.repository.

Solution

• check-merge-queue-changelogs: Fetch refs/pull/<number>/head into refs/remotes/pr/<number>/head and use that ref instead of origin/$PR_BRANCH. This also eliminates the redundant gh api lookup for branch name.
• changelog-check.yml: Pass head-ref: refs/pull/${{ github.event.pull_request.number }}/head to MetaMask/github-tools/.github/actions/check-changelog@v1.

References

Fixes #10579

Checklist

• I've updated the test suite for new or updated code as appropriate
• I've updated documentation (JSDoc, Markdown, etc.) for new or updated code as appropriate
• I've communicated my changes to consumers by updating changelogs for packages I've changed
• I've introduced breaking changes in this PR and have prepared draft pull requests for clients and consumer packages to resolve them

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Note

Low Risk
CI-only workflow changes with no runtime or application code impact.

Overview
Fixes changelog CI for fork pull requests by resolving the PR head via GitHub’s refs/pull/<number>/head instead of assuming the head branch exists on origin/.

In check-merge-queue-changelogs, the gh api branch lookup is replaced with a git fetch of that pull ref into refs/remotes/pr/<number>/head; merge-base, diff, and git show for changelog validation all use that ref. In changelog-check.yml, check-changelog now receives head-ref: refs/pull/.../head instead of github.head_ref.

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