Add Dependabot auto-merge workflow for minor and patch updates (#112)

* Initial plan

* add Dependabot auto-merge workflow for minor and patch updates

Co-authored-by: THoguet <61246905+THoguet@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: THoguet <61246905+THoguet@users.noreply.github.com>

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

@@ -0,0 +1,28 @@
+name: Dependabot Auto-merge
+
+on:
+    pull_request:
+        branches: [main]
+
+permissions:
+    contents: write
+    pull-requests: write
+
+jobs:
+    auto-merge:
+        name: Auto-merge Dependabot minor and patch updates
+        runs-on: ubuntu-latest
+        if: github.actor == 'dependabot[bot]'
+        steps:
+            - name: Fetch Dependabot metadata
+              id: metadata
+              uses: dependabot/fetch-metadata@v2.5.0
+
+            - name: Auto-merge minor and patch updates
+              if: |
+                  steps.metadata.outputs.update-type == 'version-update:semver-minor' ||
+                  steps.metadata.outputs.update-type == 'version-update:semver-patch'
+              run: gh pr merge --auto --squash "$PR_URL"
+              env:
+                  PR_URL: ${{ github.event.pull_request.html_url }}
+                  GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}