Add PistonQueue, temporarily set limit to 1

containers/.github/workflows/build.yml

@@ -47,6 +47,18 @@ jobs:
             type=semver,pattern={{major}}.{{minor}}
             type=semver,pattern={{major}}
 
+      - name: Queue - Docker meta
+        id: queue-meta
+        uses: docker/metadata-action@v3
+        with:
+          images: |
+            ghcr.io/civmc/civdocker/queue
+          tags: |
+            type=raw,value=latest,enable=${{ endsWith(github.ref, github.event.repository.default_branch) }}
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=semver,pattern={{major}}
+
       - name: Set up Docker Buildx
         id: buildx
         uses: docker/setup-buildx-action@v1
@@ -75,5 +87,13 @@ jobs:
           tags: ${{ steps.paper-meta.outputs.tags }}
           labels: ${{ steps.paper-meta.outputs.labels }}
 
+      - name: Build and push Queue Docker image
+        uses: docker/build-push-action@v2
+        with:
+          context: queue
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ${{ steps.paper-meta.outputs.tags }}
+          labels: ${{ steps.paper-meta.outputs.labels }}
+