ci: Auto Label

.github/workflows/labeler.yml

@@ -0,0 +1,37 @@
+name: Label PR with LGTM on approval
+
+on:
+  pull_request_review:
+    types: [submitted]
+
+jobs:
+  label_on_approve:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Check if review is approved
+        id: review_check
+        run: |
+          if [[ "${{ github.event.review.state }}" == "approved" ]]; then
+            echo "::set-output name=review_approved::true"
+          else
+            echo "::set-output name=review_approved::false"
+            echo "This review is not an approval. Exiting."
+            exit 0
+          fi
+
+      - name: Add LGTM label
+        if: steps.review_check.outputs.review_approved == 'true'
+        uses: actions/github-script@v6
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          script: |
+            const { owner, repo } = context.repo;
+            const pr_number = context.payload.pull_request.number;
+
+            await github.issues.addLabels({
+              owner,
+              repo,
+              issue_number: pr_number,
+              labels: ['lgtm']
+            });