feat: update Docker configuration for combined frontend and backend build process

.dockerignore

@@ -1,12 +1,12 @@
+yarn-error.log
 node_modules
 **/node_modules
 npm-debug.log
 yarn-error.log
-dist
 tmp
 temp
 .git
 .gitignore
-Dockerfile*
-frontend/dist
 backend/coverage
+# Keep built frontend out of context cache noise but allow source
+frontend/dist

.github/workflows/BuildAndPushContainer.yml

@@ -8,7 +8,7 @@ on:
 
 env:
   REGISTRY: ghcr.io
-  IMAGE_NAME: ${{ github.repository }}/backend
+  IMAGE_NAME: ${{ github.repository }}/app
 
 jobs:
   build-and-push:
@@ -47,12 +47,16 @@ jobs:
       - name: Build and push Docker image (multi-arch)
         uses: docker/build-push-action@v6
         with:
-          context: ./frontend
-          file: ./frontend/Dockerfile
+          context: .
+          file: ./Dockerfile
           push: true
           platforms: linux/amd64,linux/arm64
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
+          build-args: |
+            NODE_VERSION=20-bookworm-slim
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
 
       - name: Notify updater (GET, bearer)
         if: ${{ success() && github.ref == 'refs/heads/main' }}

Dockerfile

@@ -0,0 +1,46 @@
+######## Root Combined Frontend + Backend Build ########
+## Build args (can be overridden)
+ARG NODE_VERSION=20-bookworm-slim
+
+########################
+# 1) Frontend build     #
+########################
+FROM node:${NODE_VERSION} AS frontend-build
+WORKDIR /frontend
+COPY frontend/package*.json ./
+RUN npm install --no-audit --no-fund
+COPY frontend/ .
+RUN npm run build
+
+########################
+# 2) Backend build      #
+########################
+FROM node:${NODE_VERSION} AS backend-build
+WORKDIR /app
+COPY backend/package*.json ./
+RUN npm install --no-audit --no-fund
+COPY backend/ .
+# Copy built frontend assets
+COPY --from=frontend-build /frontend/dist ./public
+RUN npm run build
+
+########################
+# 3) Production image   #
+########################
+FROM node:${NODE_VERSION} AS runner
+ENV NODE_ENV=production
+WORKDIR /app
+
+# Install production deps
+COPY backend/package*.json ./
+RUN npm install --omit=dev --no-audit --no-fund
+
+# Copy backend dist + public
+COPY --from=backend-build /app/dist ./dist
+COPY --from=backend-build /app/public ./public
+
+ENV PORT=3000 \
+    SERIAL_BAUD=115200
+
+EXPOSE 3000
+CMD ["node", "dist/main.js"]

frontend/docker-compose.yml

@@ -2,7 +2,7 @@ services:
   app:
     build:
       context: ..
-      dockerfile: frontend/Dockerfile
+      dockerfile: Dockerfile
     container_name: schafkop-app
     restart: unless-stopped
     environment: