Use GitHub API to get correct PR submitter (#2791)

.github/workflows/require-changelog-for-PRs.yml

@@ -10,14 +10,21 @@ jobs:
     # dependabot PRs are automerged if CI passes; we shouldn't block these
     if: github.actor != 'dependabot[bot]'
     env:
-      PR_SUBMITTER: ${{ github.actor }}
       PR_NUMBER: ${{ github.event.number }}
       PR_BASE: ${{ github.base_ref }}
     steps:
       - uses: actions/checkout@v4
       - name: Fetch PR base
         run: git fetch --no-tags --prune --depth=1 origin
+
+      # cannot use `github.actor`: the triggering commit may be authored by a maintainer
+      - name: Get PR submitter
+        id: get-submitter
+        run: curl -sSfL https://api.github.com/repos/sharkdp/bat/pulls/${PR_NUMBER} | jq -r '"submitter=" + .user.login' | tee -a $GITHUB_OUTPUT
+
       - name: Search for added line in changelog
+        env:
+          PR_SUBMITTER: ${{ steps.get-submitter.outputs.submitter }}
         run: |
           ADDED=$(git diff -U0 "origin/${PR_BASE}" HEAD -- CHANGELOG.md | grep -P '^\+[^\+].+$')
           echo "Added lines in CHANGELOG.md:"

CHANGELOG.md

@@ -9,6 +9,7 @@
 - Upgrade to Rust 2021 edition #2748 (@cyqsimon)
 - Refactor and cleanup build script #2756 (@cyqsimon)
 - Checks changelog has been written to for PRs in CI #2766 (@cyqsimon)
+  - Use GitHub API to get correct PR submitter #2791 (@cyqsimon)
 - Minor benchmark script improvements #2768 (@cyqsimon)
 - Update and improve `zsh` completion, see #2772 (@okapia)