Add combine-pr workflow (#6831)

Author: eddumelendez

.github/workflows/combine-prs.yml

@@ -0,0 +1,17 @@
+name: Combine PRs
+
+on:
+  workflow_dispatch:
+
+jobs:
+  combine-prs:
+    permissions:
+      contents: write
+      pull-requests: write
+    runs-on: ubuntu-latest
+    steps:
+      - name: combine-prs
+        id: combine-prs
+        uses: github/combine-prs@v2.1.0
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}