chore(build): Update and rename .github/workflows/main.yml to automer…

…ge.yml (#4085)

Testing the waters with an automerge capability provided by https://github.com/marketplace/actions/merge-pull-requests

To try it out, add the `ready to merge` label and your PR will be merged automatically after checks pass.

automerge.yml

@@ -0,0 +1,28 @@
+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/automerge-action@de3a4d6a4975252444319cc9ab21b02d8d657229"
+        env:
+          GITHUB_TOKEN: "${{ secrets.GITHUB_TOKEN }}"
+          LABELS: "!wip,!work in progress,!do not merge"
+          AUTOMERGE: "ready to merge"
+          MERGE_METHOD: "rebase"
+          MERGE_FORKS: "true"