Add automerge bot

.github/workflows/auto-merge.yml

@@ -0,0 +1,20 @@
+name: Automerge
+
+on:
+  pull_request_target: { types: [opened, synchronize] }
+  issue_comment: { types: [created] }
+
+jobs:
+  auto-merge-bot:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v0.3
+      - name: Run Codeowners merge check
+        uses: casassg/auto-merge-bot@master
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          assign_reviewer: true
+          merge_method: "rebase"
+