Add auto-merge workflow

.github/workflows/auto-merge.yml

@@ -0,0 +1,30 @@
+name: Dependabot auto-merge
+on: pull_request
+
+permissions:
+    contents: write
+    pull-requests: write
+
+jobs:
+    dependabot:
+        runs-on: ubuntu-latest
+        if: ${{ github.actor == 'dependabot[bot]' }}
+        steps:
+            - name: Dependabot metadata
+              id: metadata
+              uses: dependabot/fetch-metadata@c9c4182bf1b97f5224aee3906fd373f6b61b4526 # v1.3.3
+              with:
+                  github-token: ${{ secrets.GITHUB_TOKEN }}
+
+            - name: Approve a PR
+              run: gh pr review --approve "$PR_URL"
+              env:
+                  PR_URL: ${{github.event.pull_request.html_url}}
+                  GH_TOKEN: ${{secrets.WORKFLOW_TOKEN}}
+
+            - name: Enable auto-merge for Dependabot PRs
+              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.WORKFLOW_TOKEN}}