update frontend building

frontend/Dockerfile

@@ -9,8 +9,8 @@ WORKDIR /app
 # Copy package files for dependency installation
 COPY package*.json .npmrc ./
 
-# Install dependencies
+# Install dependencies (NODE_ENV must not be production so devDependencies are installed)
-RUN npm ci --include=dev
+RUN NODE_ENV=development npm ci
 
 # Copy source code
 COPY . .