ci(dependabot): enable auto-merge workflow

Author: sebthom

.github/workflows/build.yml

@@ -75,6 +75,10 @@ jobs:
       run: env | sort
 
 
+    - name: "Show: Bash version"
+      run: bash --version
+
+
     - name: Git Checkout
       uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
 
@@ -156,6 +160,27 @@ jobs:
       DOCKER_PUSH_GHCR: ${{ steps.docker_push_actions.outputs.DOCKER_PUSH_GHCR }}
 
 
+  ###########################################################
+  dependabot-pr-auto-merge:
+  ###########################################################
+    needs: [build]
+    # The PR author remains stable when a maintainer reruns a Dependabot workflow.
+    if: >-
+      ${{
+        github.event_name == 'pull_request' &&
+        github.event.pull_request.user.login == 'dependabot[bot]'
+      }}
+
+    permissions:
+      contents: write
+      pull-requests: write
+
+    uses: sebthom/gha-shared/.github/workflows/reusable.dependabot-auto-merge.yml@v1
+    with:
+      package-ecosystems: '["github-actions"]'
+      merge-major-updates: true
+
+
   ###########################################################
   delete-untagged-images:
   ###########################################################