feat(ci): add dependabot auto-merge for patch and minor updates

Author: markuslf

.github/workflows/dependabot-auto-merge.yml

@@ -0,0 +1,25 @@
+name: 'Linuxfabrik: Dependabot auto-merge'
+
+on:
+  pull_request: {}
+
+permissions:
+  contents: 'write'
+  pull-requests: 'write'
+
+jobs:
+  auto-merge:
+    runs-on: 'ubuntu-latest'
+    if: 'github.actor == ''dependabot[bot]'''
+    steps:
+
+      - uses: 'dependabot/fetch-metadata@v2'
+        id: 'meta'
+
+      - if: >-
+          steps.meta.outputs.update-type == 'version-update:semver-patch'
+          || steps.meta.outputs.update-type == 'version-update:semver-minor'
+        run: 'gh pr merge --auto --squash "$PR_URL"'
+        env:
+          PR_URL: '${{ github.event.pull_request.html_url }}'
+          GH_TOKEN: '${{ secrets.GITHUB_TOKEN }}'