Use nginx (official Astro recommendation)

Dockerfile

@@ -1,14 +1,11 @@
-FROM node:20-alpine AS builder
+FROM node:20-alpine AS build
 WORKDIR /app
 COPY package*.json ./
 RUN npm install
 COPY . .
 RUN npm run build
 
-FROM node:20-alpine
-WORKDIR /app
-COPY --from=builder /app/dist ./dist
-RUN npm install -g serve
+FROM nginx:alpine AS runtime
+COPY --from=build /app/dist /usr/share/nginx/html
 EXPOSE 80
-ENV NODE_ENV=production
-CMD ["serve", "-s", "dist", "-l", "0.0.0.0:80"]
+CMD ["nginx", "-g", "daemon off;"]