Update Dockerfile for improved production readiness

- Ensure CSS variables are included in the build process.
- Replace `node` with `serve` for serving the production build.
- Adjust container health check timings for quicker feedback.

Dockerfile

@@ -4,24 +4,19 @@ WORKDIR /app
 COPY package*.json ./
 RUN npm ci
 COPY . .
+# Ensure CSS variables are present
+RUN mkdir -p public/styles
+RUN cp -r styles/* public/styles/ || true
 RUN npm run build
 
 FROM node:20-alpine AS production
 
 WORKDIR /app
-ENV NODE_ENV=production
-
-# Kopiere package.json und package-lock.json für Produktions-Abhängigkeiten
-COPY package*.json ./
-# Installiere nur Produktions-Abhängigkeiten
-RUN npm ci --only=production && npm cache clean --force
-
-# Kopiere das gebaute Projekt
+RUN npm install -g serve
 COPY --from=build /app/dist ./dist
 
-# install minimal deps to run node if needed (alpine already has node)
 EXPOSE 3000
-CMD ["node", "./dist/server/entry.mjs"]
+CMD ["serve", "-s", "dist", "-l", "3000"]
 
-HEALTHCHECK --interval=30s --timeout=5s --start-period=10s --retries=3 \
+HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
   CMD wget -qO- http://localhost:3000/ || exit 1