test: Add some automated workflows.

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

@@ -0,0 +1,36 @@
+---
+name: Auto-merge Dependabot Pull Requests
+on: pull_request_target
+
+permissions:
+  contents: write
+  issues: write
+  pull-requests: write
+  repository-projects: write
+
+jobs:
+  dependabot:
+    runs-on: ubuntu-latest
+    if: ${{ github.actor == 'dependabot[bot]' }}
+    steps:
+      - name: Dependabot metadata
+        id: metadata
+        uses: dependabot/[email protected]
+        with:
+          github-token: "${{ secrets.GITHUB_TOKEN }}"
+
+      - name: Auto-merge Dependabot PRs for semver-minor updates
+        if: ${{steps.metadata.outputs.update-type == 'version-update:semver-minor'}}
+        env:
+          PR_URL: ${{github.event.pull_request.html_url}}
+          GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}
+        run: |
+          gh pr merge --auto --squash "${PR_URL}"
+
+      - name: Auto-merge Dependabot PRs for semver-patch updates
+        if: ${{steps.metadata.outputs.update-type == 'version-update:semver-patch'}}
+        env:
+          PR_URL: ${{github.event.pull_request.html_url}}
+          GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}
+        run: |
+          gh pr merge --auto --squash "${PR_URL}"

.github/workflows/markdownlint.yml

@@ -50,7 +50,7 @@ jobs:
       - name: Run Markdownlint
         run: |
           npm exec -y -- \
-            markdownlint-cli@0.39.0 \
+            markdownlint-cli@0.40.0 \
               --ignore=node_modules \
               --ignore=.github \
               --ignore=.templates \