Use jacogr/action-approve (#616)

.github/workflows/approve.yml

@@ -0,0 +1,14 @@
+name: PR
+
+on: pull_request
+
+jobs:
+  auto-approve:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: jacogr/action-approve@master
+        with:
+          authors: jacogr
+          labels: automerge
+          token: ${{ secrets.GH_PAT_BOT }}