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Dockerfile

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+# Frontend Dockerfile - React with multi-stage build
+
+# Stage 1: Build
+FROM node:20-alpine AS builder
+
+WORKDIR /app
+
+# Copy package files
+COPY package.json yarn.lock ./
+
+# Install dependencies
+RUN yarn install --frozen-lockfile
+
+# Copy source code
+COPY . .
+
+# Build arguments for environment variables
+ARG REACT_APP_BACKEND_URL
+ENV REACT_APP_BACKEND_URL=$REACT_APP_BACKEND_URL
+
+# Build the application
+RUN yarn build
+
+# Stage 2: Production with Nginx
+FROM nginx:alpine AS production
+
+# Copy custom nginx config
+COPY nginx.conf /etc/nginx/conf.d/default.conf
+
+# Copy built assets from builder stage
+COPY --from=builder /app/build /usr/share/nginx/html
+
+# Create non-root user for security
+RUN adduser -D -g '' appuser && \
+    chown -R appuser:appuser /usr/share/nginx/html && \
+    chown -R appuser:appuser /var/cache/nginx && \
+    chown -R appuser:appuser /var/log/nginx && \
+    touch /var/run/nginx.pid && \
+    chown -R appuser:appuser /var/run/nginx.pid
+
+# Expose port
+EXPOSE 80
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
+    CMD wget --no-verbose --tries=1 --spider http://localhost:80/ || exit 1
+
+# Start nginx
+CMD ["nginx", "-g", "daemon off;"]