workflows: remove automerge action for other automerge methods (#28993)

.github/workflows/automerge.yml

@@ -1,34 +0,0 @@
-name: automerge
-
-on:
-  pull_request:
-    types:
-      - labeled
-      - unlabeled
-      - synchronize
-      - opened
-      - edited
-      - ready_for_review
-      - reopened
-      - unlocked
-  pull_request_review:
-    types:
-      - submitted
-  check_suite:
-    types:
-      - completed
-  status: {}
-
-jobs:
-  automerge:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Automerge
-        uses: pascalgn/automerge-action@v0.12.0
-        env:
-          MERGE_LABELS: automerge
-          MERGE_METHOD: squash
-          MERGE_RETRIES: 1
-          GITHUB_TOKEN: "${{ secrets.GITHUB_TOKEN }}"
-        with:
-          args: "--trace"

.github/workflows/licenses-update.yml

@@ -29,8 +29,9 @@ jobs:
     - name: Preview report diff
       run: git --no-pager diff
 
-    - name: Open pull request
+    - name: Create pull request
       uses: peter-evans/create-pull-request@v3
+      id: cpr
       with:
         labels: automerge
         base: main
@@ -47,3 +48,11 @@ jobs:
         # currently @sourcegraph-bot cross-repo-github-actions in 1password
         # configure in https://github.com/sourcegraph/sourcegraph/settings/secrets/GH_REPO_TOKEN
         token: ${{ secrets.GH_REPO_TOKEN }}
+
+    - name: Enable pull request automerge
+      if: steps.cpr.outputs.pull-request-operation == 'created'
+      uses: peter-evans/enable-pull-request-automerge@v1
+      with:
+        token: ${{ secrets.GH_REPO_TOKEN }}
+        pull-request-number: ${{ steps.cpr.outputs.pull-request-number }}
+        merge-method: squash

renovate.json

@@ -1,7 +1,7 @@
 {
   "$schema": "http://json.schemastore.org/renovate",
   "extends": ["github>sourcegraph/renovate-config"],
-  "semanticCommits": false,
+  "semanticCommits": "disabled",
   "rebaseWhen": "never",
   "packageRules": [
     {
@@ -27,7 +27,7 @@
       "packagePatterns": ["^alpine:3.12"],
       "fileMatch": ["^Dockerfile$"],
       "paths": ["docker-images/**"],
-      "labels": ["automerge"]
+      "automerge": true
     }
   ]
 }