optimize auto merge for github actions

Author: tinohager

.github/workflows/dependabot-github-actions-automerge.yml

@@ -0,0 +1,26 @@
+name: Dependabot GitHub Actions Auto Merge
+
+on:
+  pull_request:
+    paths:
+    - '.github/workflows/**'
+    branches: [ main ]
+
+permissions:
+  pull-requests: write
+  contents: write
+
+jobs:
+  dependabot:
+    runs-on: ubuntu-latest
+    if: ${{ github.actor == 'dependabot[bot]' }}
+    steps:
+      - name: Dependabot metadata
+        id: dependabot-metadata
+        uses: dependabot/fetch-metadata@v2
+      - name: Enable auto-merge for Dependabot PRs
+        if: ${{steps.dependabot-metadata.outputs.package-ecosystem == 'github_actions'}}
+        run: gh pr merge --auto --merge "$PR_URL"
+        env:
+          PR_URL: ${{github.event.pull_request.html_url}}
+          GH_TOKEN: ${{secrets.GITHUB_TOKEN}}

.github/workflows/dotnet.yml

@@ -33,19 +33,3 @@ jobs:
       working-directory: ./src
       run: |
         dotnet test --configuration Release --no-restore --no-build --verbosity normal
-
-  dependabot:
-    name: Dependabot Auto Merge
-    runs-on: ubuntu-latest
-    needs:
-      - build
-    if: ${{ github.event_name == 'pull_request' && github.actor == 'dependabot[bot]' }}
-
-    steps:
-      - name: Dependabot Auto Merge
-        uses: dailydevops/dependamerge-action@v1.2.19
-        with:
-          token: ${{ secrets.GITHUB_TOKEN }}
-          command: squash
-          handle-submodule: true
-          target: minor