Split auto-merge into separate workflow

.github/workflows/auto-merge.yml

@@ -0,0 +1,18 @@
+name: Enable Auto Merge
+on: pull_request
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  auto-merge:
+    runs-on: ubuntu-latest
+    if: ${{ github.actor == 'wbrawner' || github.actor == 'dependabot[bot]' }}
+    steps:
+      - name: Enable auto-merge for Dependabot PRs
+        run: gh pr merge --auto --rebase "$PR_URL"
+        env:
+          PR_URL: ${{github.event.pull_request.html_url}}
+          GH_TOKEN: ${{secrets.GH_TOKEN}}
+

.github/workflows/pull-request.yml

@@ -1,11 +1,6 @@
 name: Pull request workflow
 on: pull_request
 
-permissions:
-  contents: write
-  pull-requests: write
-  checks: write
-
 jobs:
   test:
     name: Build and Test
@@ -30,13 +25,3 @@ jobs:
           path: "*/build/test-results/test/*.xml"
           reporter: java-junit
           fail-on-error: true
-  automerge:
-    name: Enable automerge
-    runs-on: ubuntu-latest
-    if: ${{ github.actor == 'wbrawner' || github.actor == 'dependabot[bot]' }}
-    steps:
-      - name: Enable auto-merge
-        run: gh pr merge --auto --rebase "$PR_URL"
-        env:
-          PR_URL: ${{github.event.pull_request.html_url}}
-          GITHUB_TOKEN: ${{secrets.GH_TOKEN}}