fix(frontend): use multi-stage docker build to be self-contained [32788f42]

fotograf-de-scraper/frontend/Dockerfile

@@ -1,18 +1,34 @@
-# Use a lightweight Nginx image to serve the React app
+# Stage 1: Build the React application
+FROM node:18-alpine AS builder
+
+WORKDIR /app
+
+# Copy package.json and package-lock.json
+COPY package*.json ./
+
+# Install dependencies
+RUN npm install
+
+# Copy the rest of the application source code
+COPY . .
+
+# Build the application
+RUN npm run build
+
+# Stage 2: Serve the application with Nginx
 FROM nginx:alpine
 
-# Set working directory to nginx's default static file directory
+# Set working directory
 WORKDIR /usr/share/nginx/html
 
-# Remove default Nginx static assets
+# Remove default Nginx assets
 RUN rm -rf ./*
 
-# Copy the built React app from the builder stage
-# The React app is built using `npm run build` which creates a `dist` directory
-COPY ./dist .
+# Copy built assets from the builder stage
+COPY --from=builder /app/dist .
 
 # Expose port 80
 EXPOSE 80
 
-# Command to start Nginx (default command of the base image)
+# Start Nginx
 CMD ["nginx", "-g", "daemon off;"]