refactor: optimize Dockerfile by restructuring build steps and improving clarity

app/Dockerfile

@@ -1,34 +1,50 @@
+# Build stage
 FROM node:24-trixie-slim AS build
 
 WORKDIR /app
 
-COPY backend/package*.json backend/
-COPY frontend/package*.json frontend/
-RUN cd backend && npm ci
-RUN cd frontend && npm ci
+# Copy sources required for build
+COPY backend/*.json backend/
+COPY backend/src backend/src
 
-COPY . .
+COPY frontend/*.json frontend/
+COPY frontend/vite.config.ts frontend/vite.config.ts
+COPY frontend/index.html frontend/index.html
+COPY frontend/src frontend/src
+COPY frontend/test frontend/test
 
-RUN cd backend && npm run build
-RUN cd frontend && npm run build
-RUN cd backend && npm prune --omit=dev
+COPY templates templates
+COPY templates.json templates.json
 
+# Build backend and frontend
+RUN cd backend && npm ci && npm run build && npm prune --omit=dev
+RUN cd frontend && npm ci && npm run build
+
+# Build the container
 FROM node:24-trixie-slim AS runtime
 
 WORKDIR /app
-ENV NODE_ENV=production
-ENV PORT=3000
 
+# Copy built artifacts
 COPY --from=build /app/dist dist
 COPY --from=build /app/templates templates
 COPY --from=build /app/templates.json templates.json
 COPY --from=build /app/backend/node_modules dist/backend/node_modules
 
-WORKDIR /app
+# Copy entrypoint and healthcheck scripts
 COPY entrypoint.sh entrypoint.sh
 COPY healthcheck.js healthcheck.js
+
+# Ensure entrypoint script is executable
 RUN chmod +x entrypoint.sh
 
+# Set environment variables and expose port
+ENV NODE_ENV=production
+ENV PORT=3000
 EXPOSE 3000
+
+# Configure health check
 HEALTHCHECK --interval=30s --timeout=5s --start-period=15s --retries=3 CMD ["node", "/app/healthcheck.js"]
+
+# Configure entrypoint
 ENTRYPOINT ["./entrypoint.sh"]