Add .github/workflows/automerge.yml

Auto merge pull requests when ready.
Auto rebase or auto merge updates to master into pull requests to keep it up to date.

https://github.com/pascalgn/automerge-action

Author: angularsen

.github/workflows/automerge.yml

@@ -0,0 +1,26 @@
+name: automerge
+on:
+  pull_request:
+    types:
+      - labeled
+      - unlabeled
+      - synchronize
+      - opened
+      - edited
+      - ready_for_review
+      - reopened
+      - unlocked
+  pull_request_review:
+    types:
+      - submitted
+  status: {}
+jobs:
+  automerge:
+    runs-on: ubuntu-latest
+    steps:
+      - name: automerge
+        uses: pascalgn/[email protected]
+        env:
+          GITHUB_TOKEN: "${{ secrets.GITHUB_TOKEN }}"
+          LABELS: !wip
+          MERGE_METHOD: squash