Refactor Docker setup for Astro SSR application and Nginx reverse proxy

- Updated docker-compose.yml to define services for the Astro SSR application and Nginx reverse proxy, including health checks and environment variables.
- Modified Dockerfile to implement a multi-stage build process, optimizing dependency installation and production setup.
- Enhanced nginx.conf with improved proxy settings, security headers, and caching strategies for static assets, ensuring better performance and security.

Dockerfile

@@ -1,17 +1,40 @@
+# Multi-stage build for Astro SSR application
 FROM node:lts AS base
 WORKDIR /app
 
+# Install dependencies
 FROM base AS deps
 COPY package*.json ./
-RUN npm install
+RUN npm ci --only=production
 
+# Build stage
 FROM base AS build
-COPY --from=deps /app/node_modules ./node_modules
+COPY package*.json ./
+RUN npm ci
 COPY . .
 RUN npm run build
 
-FROM nginx:stable-alpine AS deploy
-COPY --from=build /app/dist /usr/share/nginx/html
-COPY ./nginx/nginx.conf /etc/nginx/nginx.conf
+# Production stage
+FROM node:lts-alpine AS production
+WORKDIR /app
 
-EXPOSE 8080
+# Copy necessary files
+COPY --from=deps /app/node_modules ./node_modules
+COPY --from=build /app/dist ./dist
+COPY --from=build /app/server.js ./server.js
+COPY --from=build /app/package.json ./package.json
+COPY --from=build /app/.env ./.env
+
+# Set environment
+ENV NODE_ENV=production
+ENV PORT=3000
+
+# Expose port
+EXPOSE 3000
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=3s --start-period=40s \
+  CMD node -e "require('http').get('http://localhost:3000/', (r) => {if (r.statusCode !== 200) throw new Error(r.statusCode)})"
+
+# Start server
+CMD ["node", "server.js"]