feat(deploy): add production runtime foundation

Dockerfile

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+FROM node:20-alpine AS deps
+WORKDIR /app
+
+COPY package.json package-lock.json ./
+RUN npm ci
+
+FROM node:20-alpine AS builder
+WORKDIR /app
+
+COPY --from=deps /app/node_modules ./node_modules
+COPY . .
+RUN npm run build
+
+FROM node:20-alpine AS prod-deps
+WORKDIR /app
+
+COPY package.json package-lock.json ./
+RUN npm ci --omit=dev
+
+FROM node:20-alpine AS runner
+WORKDIR /app
+
+ENV NODE_ENV=production
+
+COPY --from=prod-deps /app/node_modules ./node_modules
+COPY --from=builder /app/package.json ./package.json
+COPY --from=builder /app/next.config.mjs ./next.config.mjs
+COPY --from=builder /app/.next ./.next
+
+USER node
+
+EXPOSE 3000
+
+CMD ["npm", "run", "start", "--", "-H", "0.0.0.0", "-p", "3000"]