chore: auto label github prs

.github/workflows/gh_pr_label.yml

@@ -0,0 +1,18 @@
+name: "GitHub Pull Requests Labeler"
+
+on:
+  pull_request:
+    types: [opened, reopened, ready_for_review]
+
+jobs:
+  add-label:
+    runs-on: ubuntu-latest
+    permissions:
+      pull-requests: write
+    steps:
+      - name: Add waiting-for-review label
+        uses: actions-ecosystem/action-add-labels@v1
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          labels: "pr: waiting for review"
+          number: ${{ github.event.pull_request.number }}