Moved examples together

examples/docker/next.dockerfile

@@ -0,0 +1,38 @@
+# === Stage 1: deps ===
+FROM node:20-alpine AS deps
+WORKDIR /app
+
+COPY package.json package-lock.json* yarn.lock* pnpm-lock.yaml* ./
+RUN \
+  if [ -f yarn.lock ]; then yarn install --frozen-lockfile; \
+  elif [ -f pnpm-lock.yaml ]; then corepack enable pnpm && pnpm install --frozen-lockfile; \
+  else npm ci; \
+  fi
+
+# === Stage 2: build ===
+FROM node:20-alpine AS builder
+WORKDIR /app
+
+COPY --from=deps /app/node_modules ./node_modules
+COPY . .
+
+ARG APP_ENV=production
+ENV NEXT_PUBLIC_APP_ENV=$APP_ENV
+
+RUN npm run build
+
+# === Stage 3: runner ===
+FROM node:20-alpine AS runner
+WORKDIR /app
+
+ENV NODE_ENV=production
+
+COPY --from=builder /app/public ./public
+COPY --from=builder /app/.next/standalone ./
+COPY --from=builder /app/.next/static ./.next/static
+
+EXPOSE 3000
+ENV PORT=3000
+ENV HOSTNAME="0.0.0.0"
+
+CMD ["node", "server.js"]