ci(workflows): use sub-actions

.github/workflows/__merge-clean.yml

@@ -0,0 +1,39 @@
+on:
+  workflow_call:
+    inputs:
+      tags:
+        type: string
+        required: true
+      alternate_registry:
+        type: string
+        default: ''
+
+permissions:
+  contents: read
+
+jobs:
+  merge_clean:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Check out code
+        uses: actions/checkout@v4
+
+      - name: Log in to Docker Hub
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Merge and clean
+        uses: gotenberg/gotenberg-release-action/actions/merge-clean@main
+        with:
+          docker_hub_username: ${{ secrets.DOCKERHUB_USERNAME }}
+          docker_hub_password: ${{ secrets.DOCKERHUB_TOKEN }}
+          tags: ${{ inputs.tags }}
+          alternate_registry: ${{ inputs.alternate_registry }}