ci(docker): publish homelable-mcp image to GHCR

Add mcp matrix entry in docker-publish workflow so the MCP server
image is built and pushed alongside backend/frontend. Also wire the
prebuilt compose file so users can pull and run it directly.

Closes #162

.github/workflows/docker-publish.yml

@@ -16,14 +16,21 @@ jobs:
       matrix:
         include:
           - image: ghcr.io/pouzor/homelable-backend
+            context: .
             dockerfile: Dockerfile.backend
             build_args: ""
           - image: ghcr.io/pouzor/homelable-frontend
+            context: .
             dockerfile: Dockerfile.frontend
             build_args: ""
           - image: ghcr.io/pouzor/homelable-frontend-standalone
+            context: .
             dockerfile: Dockerfile.frontend
             build_args: "VITE_STANDALONE=true"
+          - image: ghcr.io/pouzor/homelable-mcp
+            context: ./mcp
+            dockerfile: Dockerfile.mcp
+            build_args: ""
 
     steps:
       - uses: actions/checkout@v4
@@ -55,8 +62,8 @@ jobs:
       - name: Build and push
         uses: docker/build-push-action@v6
         with:
-          context: .
+          context: ${{ matrix.context }}
-          file: ${{ matrix.dockerfile }}
+          file: ${{ matrix.context }}/${{ matrix.dockerfile }}
           platforms: linux/amd64,linux/arm64
           push: true
           tags: ${{ steps.meta.outputs.tags }}

docker-compose.prebuilt.yml

@@ -24,6 +24,20 @@ services:
     networks:
       - homelable
 
+  mcp:
+    image: ghcr.io/pouzor/homelable-mcp:latest
+    restart: unless-stopped
+    ports:
+      - "8001:8001"
+    env_file:
+      - .env
+    environment:
+      BACKEND_URL: "http://backend:8000"
+    depends_on:
+      - backend
+    networks:
+      - homelable
+
 volumes:
   backend_data: