feat: implement Dockerfile, entrypoint, and health check for Node.js application

app-new/Dockerfile

@@ -0,0 +1,34 @@
+FROM node:24-trixie-slim AS build
+
+WORKDIR /app
+
+COPY app-new/backend/package*.json backend/
+COPY app-new/frontend/package*.json frontend/
+RUN cd backend && npm ci
+RUN cd frontend && npm ci
+
+COPY app-new .
+
+RUN cd backend && npm run build
+RUN cd frontend && npm run build
+RUN cd backend && npm prune --omit=dev
+
+FROM node:24-trixie-slim AS runtime
+
+WORKDIR /app
+ENV NODE_ENV=production
+ENV PORT=3000
+
+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.sh entrypoint.sh
+COPY healthcheck.js healthcheck.js
+RUN chmod +x entrypoint.sh
+
+EXPOSE 3000
+HEALTHCHECK --interval=30s --timeout=5s --start-period=15s --retries=3 CMD ["node", "/app/healthcheck.js"]
+ENTRYPOINT ["./entrypoint.sh"]

app-new/entrypoint.sh

@@ -0,0 +1,4 @@
+#!/usr/bin/env sh
+set -eu
+
+exec node /app/dist/backend/server.js

app-new/healthcheck.js

@@ -0,0 +1,39 @@
+#!/usr/bin/env node
+"use strict";
+
+const http = require("node:http");
+
+const port = Number.parseInt(process.env.PORT || "3000", 10);
+const path = process.env.HEALTHCHECK_PATH || "/api/health";
+const timeoutMs = Number.parseInt(process.env.HEALTHCHECK_TIMEOUT_MS || "3000", 10);
+
+const req = http.request(
+  {
+    host: "127.0.0.1",
+    port,
+    path,
+    method: "GET",
+    timeout: timeoutMs
+  },
+  (res) => {
+    // Drain the response so the socket can close cleanly.
+    res.resume();
+
+    if (res.statusCode && res.statusCode >= 200 && res.statusCode < 400) {
+      process.exit(0);
+      return;
+    }
+
+    process.exit(1);
+  }
+);
+
+req.on("timeout", () => {
+  req.destroy(new Error("healthcheck timeout"));
+});
+
+req.on("error", () => {
+  process.exit(1);
+});
+
+req.end();