infra: add Docker, Compose, and Nginx for staging deployment

- Dockerfile: multi-stage build (deps → builder → runner), standalone output
- docker-compose.yml: app + postgres services, health checks
- nginx/staging.letsbe.biz.conf: reverse proxy ready for certbot SSL
- Updated .env.example with all required secrets

Deploy steps:
1. Copy nginx conf to /etc/nginx/sites-enabled/
2. nginx -t && systemctl reload nginx
3. certbot --nginx -d staging.letsbe.biz
4. Create .env from .env.example
5. docker compose up -d --build

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.env.example

@@ -1,13 +1,14 @@
-# Database
-DATABASE_URI=postgresql://postgres:postgres@localhost:5432/letsbe
+# ── PostgreSQL ──
+POSTGRES_USER=letsbe
+POSTGRES_PASSWORD=your-secure-postgres-password
 
-# Payload CMS
-PAYLOAD_SECRET=your-secret-key-here-change-in-production
+# ── Payload CMS ──
+PAYLOAD_SECRET=generate-a-random-32-char-secret-here
 
-# OpenRouter (for AI brief generation)
+# ── OpenRouter (AI brief generation) ──
 OPENROUTER_API_KEY=your-openrouter-api-key
 
-# Email (Poste.io SMTP)
+# ── Email (Poste.io SMTP) ──
 SMTP_HOST=mail.letsbe.biz
 SMTP_PORT=587
 SMTP_USER=hello@letsbe.biz
@@ -15,8 +16,8 @@ SMTP_PASS=your-smtp-password
 SMTP_FROM=hello@letsbe.biz
 ADMIN_EMAIL=hello@letsbe.biz
 
-# Cal.com
+# ── Cal.com ──
 NEXT_PUBLIC_CALCOM_URL=https://cal.letsbe.biz
 
-# Site
-NEXT_PUBLIC_SITE_URL=https://letsbe.biz
+# ── Site URL ──
+NEXT_PUBLIC_SITE_URL=https://staging.letsbe.biz

Dockerfile

@@ -0,0 +1,49 @@
+FROM node:20-alpine AS base
+
+# ── Dependencies ──
+FROM base AS deps
+WORKDIR /app
+COPY package.json package-lock.json ./
+RUN npm ci --ignore-scripts
+RUN npm rebuild sharp
+
+# ── Builder ──
+FROM base AS builder
+WORKDIR /app
+COPY --from=deps /app/node_modules ./node_modules
+COPY . .
+
+# Build args become env vars at build time
+ARG DATABASE_URI
+ARG PAYLOAD_SECRET
+ARG NEXT_PUBLIC_SITE_URL
+ARG NEXT_PUBLIC_CALCOM_URL
+
+ENV DATABASE_URI=${DATABASE_URI}
+ENV PAYLOAD_SECRET=${PAYLOAD_SECRET}
+ENV NEXT_PUBLIC_SITE_URL=${NEXT_PUBLIC_SITE_URL}
+ENV NEXT_PUBLIC_CALCOM_URL=${NEXT_PUBLIC_CALCOM_URL}
+
+RUN npm run build
+
+# ── Runner ──
+FROM base AS runner
+WORKDIR /app
+
+ENV NODE_ENV=production
+ENV HOSTNAME=0.0.0.0
+ENV PORT=3000
+
+RUN addgroup --system --gid 1001 nodejs
+RUN adduser --system --uid 1001 nextjs
+
+# Copy standalone output
+COPY --from=builder /app/.next/standalone ./
+COPY --from=builder /app/.next/static ./.next/static
+COPY --from=builder /app/public ./public
+
+USER nextjs
+
+EXPOSE 3000
+
+CMD ["node", "server.js"]

docker-compose.yml

@@ -0,0 +1,45 @@
+services:
+  db:
+    image: postgres:16-alpine
+    restart: unless-stopped
+    environment:
+      POSTGRES_DB: letsbe
+      POSTGRES_USER: ${POSTGRES_USER:-letsbe}
+      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:?Set POSTGRES_PASSWORD in .env}
+    volumes:
+      - pgdata:/var/lib/postgresql/data
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U ${POSTGRES_USER:-letsbe} -d letsbe"]
+      interval: 5s
+      timeout: 5s
+      retries: 5
+
+  app:
+    build:
+      context: .
+      args:
+        DATABASE_URI: postgresql://${POSTGRES_USER:-letsbe}:${POSTGRES_PASSWORD}@db:5432/letsbe
+        PAYLOAD_SECRET: ${PAYLOAD_SECRET:?Set PAYLOAD_SECRET in .env}
+        NEXT_PUBLIC_SITE_URL: ${NEXT_PUBLIC_SITE_URL:-https://staging.letsbe.biz}
+        NEXT_PUBLIC_CALCOM_URL: ${NEXT_PUBLIC_CALCOM_URL:-}
+    restart: unless-stopped
+    ports:
+      - "127.0.0.1:3000:3000"
+    environment:
+      DATABASE_URI: postgresql://${POSTGRES_USER:-letsbe}:${POSTGRES_PASSWORD}@db:5432/letsbe
+      PAYLOAD_SECRET: ${PAYLOAD_SECRET}
+      NEXT_PUBLIC_SITE_URL: ${NEXT_PUBLIC_SITE_URL:-https://staging.letsbe.biz}
+      NEXT_PUBLIC_CALCOM_URL: ${NEXT_PUBLIC_CALCOM_URL:-}
+      SMTP_HOST: ${SMTP_HOST:-}
+      SMTP_PORT: ${SMTP_PORT:-587}
+      SMTP_USER: ${SMTP_USER:-}
+      SMTP_PASS: ${SMTP_PASS:-}
+      SMTP_FROM: ${SMTP_FROM:-hello@letsbe.biz}
+      ADMIN_EMAIL: ${ADMIN_EMAIL:-hello@letsbe.biz}
+      OPENROUTER_API_KEY: ${OPENROUTER_API_KEY:-}
+    depends_on:
+      db:
+        condition: service_healthy
+
+volumes:
+  pgdata:

nginx/staging.letsbe.biz.conf

@@ -0,0 +1,48 @@
+server {
+    listen 80;
+    listen [::]:80;
+    server_name staging.letsbe.biz;
+
+    # Certbot will add SSL config after: sudo certbot --nginx -d staging.letsbe.biz
+
+    location / {
+        proxy_pass http://127.0.0.1:3000;
+        proxy_http_version 1.1;
+        proxy_set_header Upgrade $http_upgrade;
+        proxy_set_header Connection 'upgrade';
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+        proxy_cache_bypass $http_upgrade;
+        proxy_read_timeout 86400;
+    }
+
+    # Static assets — long cache
+    location /_next/static/ {
+        proxy_pass http://127.0.0.1:3000;
+        proxy_cache_valid 200 365d;
+        add_header Cache-Control "public, max-age=31536000, immutable";
+    }
+
+    # Public assets
+    location /images/ {
+        proxy_pass http://127.0.0.1:3000;
+        proxy_cache_valid 200 30d;
+        add_header Cache-Control "public, max-age=2592000";
+    }
+
+    # Payload media uploads
+    location /media/ {
+        proxy_pass http://127.0.0.1:3000;
+        proxy_cache_valid 200 30d;
+        add_header Cache-Control "public, max-age=2592000";
+    }
+
+    # Security headers
+    add_header X-Frame-Options "SAMEORIGIN" always;
+    add_header X-Content-Type-Options "nosniff" always;
+    add_header Referrer-Policy "strict-origin-when-cross-origin" always;
+
+    client_max_body_size 50M;
+}