Add Dockerfile

Dockerfile

@@ -0,0 +1,59 @@
+# syntax=docker/dockerfile:1
+FROM node:20-alpine AS base
+WORKDIR /app
+ENV NEXT_TELEMETRY_DISABLED=1
+RUN apk add --no-cache libc6-compat
+
+# ---- deps: ติดตั้งพร้อม devDeps โดยไม่ต้องตั้ง NODE_ENV=development ----
+FROM base AS deps
+RUN corepack enable
+COPY . .
+RUN set -eux; \
+    if [ -f pnpm-lock.yaml ]; then pnpm install --frozen-lockfile --prod=false; \
+    elif [ -f yarn.lock ]; then yarn install --frozen-lockfile --production=false; \
+    elif [ -f package-lock.json ]; then npm ci --include=dev; \
+    else npm install; \
+    fi
+
+# ---- builder: ใช้ deps เดิม สร้างโปรดักชันบิลด์ ----
+FROM base AS builder
+RUN corepack enable
+COPY --from=deps /app/node_modules ./node_modules
+COPY . .
+RUN set -eux; \
+    if [ -f pnpm-lock.yaml ]; then pnpm run build; \
+    elif [ -f yarn.lock ]; then yarn build; \
+    else npm run build; \
+    fi
+
+# ---- prod-deps: เอาเฉพาะ production deps ----
+FROM base AS prod-deps
+RUN corepack enable
+COPY . .
+RUN set -eux; \
+    if [ -f pnpm-lock.yaml ]; then pnpm install --frozen-lockfile --prod --no-optional; \
+    elif [ -f yarn.lock ]; then (yarn workspaces focus --all --production || yarn install --frozen-lockfile --production=true); \
+    elif [ -f package-lock.json ]; then npm ci --omit=dev; \
+    else npm install --omit=dev; \
+    fi
+
+# ---- runner ----
+FROM node:20-alpine AS runner
+WORKDIR /app
+ENV NODE_ENV=production
+ENV HOSTNAME=0.0.0.0
+ENV PORT=3000
+ENV NEXT_TELEMETRY_DISABLED=1
+
+RUN apk add --no-cache libc6-compat \
+ && addgroup -g 1001 -S nodejs \
+ && adduser -S nextjs -u 1001 -G nodejs
+
+COPY --from=builder   /app/public        ./public
+COPY --from=builder   /app/.next         ./.next
+COPY --from=builder   /app/package.json  ./package.json
+COPY --from=prod-deps /app/node_modules  ./node_modules
+
+USER nextjs
+EXPOSE 3000
+CMD ["npm", "run", "start"]