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Dockerfile

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+# -------- Build stage --------
+FROM node:20-alpine AS builder
+
+WORKDIR /app
+
+COPY package*.json ./
+RUN npm install
+
+COPY . .
+RUN npm run build
+
+# -------- Runtime stage --------
+FROM node:20-alpine
+
+WORKDIR /app
+
+# ✅ REQUIRED for SMTP + HTTPS
+RUN apk add --no-cache ca-certificates
+
+ENV NODE_ENV=production
+
+COPY --from=builder /app/package*.json ./
+COPY --from=builder /app/node_modules ./node_modules
+COPY --from=builder /app/.next ./.next
+COPY --from=builder /app/public ./public
+
+EXPOSE 3000
+
+CMD ["npm", "start"]