feat: allow maintainers to skip changelog check

.github/workflows/changelog.yml

@@ -12,6 +12,7 @@ on:
 jobs:
   # Enforces the update of a changelog file on every pull request
   changelog:
+    if: "!contains(github.event.pull_request.labels.*.name, 'skip-changelog')"
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2