CI: Add Dependabot automation

Signed-off-by: Andrej Orsula <[email protected]>

.github/workflows/dependabot.yml

@@ -0,0 +1,27 @@
+name: Dependabot automation
+on: pull_request
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  dependabot_automation:
+    runs-on: ubuntu-latest
+    if: ${{ github.actor == 'dependabot[bot]' && github.event_name == 'pull_request' }}
+    steps:
+      - name: Fetch metadata
+        id: metadata
+        uses: dependabot/fetch-metadata@v1
+        with:
+          github-token: "${{ secrets.GITHUB_TOKEN }}"
+      - name: Approve the PR
+        env:
+          PR_URL: ${{github.event.pull_request.html_url}}
+          GH_TOKEN: ${{secrets.GITHUB_TOKEN}}
+        run: gh pr review --approve "$PR_URL"
+      - name: Enable auto-merge for the PR
+        env:
+          PR_URL: ${{github.event.pull_request.html_url}}
+          GH_TOKEN: ${{secrets.GITHUB_TOKEN}}
+        run: gh pr merge --auto --merge "$PR_URL"