[CI] Require D*-audit labels for any runtime changes (#2617)

* update generate_release_text.rb

* add checks for audit labels for runtime changes

* fix check_labels.sh

* use has_runtime_changes in check_runtime.sh

* add D1-trivial label

* fix check_labels.sh

polkadot/.github/workflows/check-labels.yml

@@ -9,8 +9,12 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+          ref: ${{ github.event.pull_request.head.ref }}
       - name: Check labels
         run: bash ${{ github.workspace }}/scripts/github/check_labels.sh
         env:
           GITHUB_PR: ${{ github.event.pull_request.number }}
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          HEAD_SHA: ${{ github.event.pull_request.head.sha }}