feat(scaffold): add Dockerfile [skip ci]

Dockerfile

@@ -0,0 +1,30 @@
+# ---- Build stage ----
+FROM node:20-alpine AS build
+WORKDIR /app
+
+COPY package.json ./
+RUN npm install
+
+COPY tsconfig.json ./
+COPY src/ ./src/
+RUN npm run build && npm prune --omit=dev
+
+# ---- Runtime stage ----
+FROM node:20-alpine
+WORKDIR /app
+
+RUN addgroup -S appgroup && adduser -S appuser -G appgroup
+
+COPY --from=build /app/dist ./dist
+COPY --from=build /app/node_modules ./node_modules
+COPY package.json ./
+
+RUN chown -R appuser:appgroup /app
+USER appuser
+
+EXPOSE 3000
+
+HEALTHCHECK --interval=30s --timeout=5s --start-period=20s --retries=3 \
+    CMD wget -qO- http://localhost:3000/health | grep -q 'UP' || exit 1
+
+CMD ["node", "--require", "./dist/tracing.js", "dist/main"]