ci: add rationale for using a PAT

.github/workflows/create-release.yaml

@@ -56,6 +56,7 @@ jobs:
       - name: Commit and tag release
         if: ${{ steps.empty.outputs.is-empty == 'false' && steps.held.outputs.is-held == 'false' }}
         env:
+          # Use a PAT instead of the default token, as the default won't trigger the release workflow on release.
           GH_TOKEN: ${{ secrets.RELEASE_TOKEN }}
         run: |
           git config user.name '${{ env.COMMITTER_NAME }}'