Docker setup.

Dockerfile.common

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+# ---------- minimal Node runtime ----------
+FROM node:20-slim
+
+# 1. safe work dir
+WORKDIR /app
+
+# 2. install prod deps only
+COPY package*.json ./
+RUN npm ci --omit=dev --ignore-scripts
+
+# 3. copy source
+COPY . .
+
+# 4. expose port placeholder (overridden in child files)
+ARG APPPORT=5000
+ENV PORT=$APPPORT
+EXPOSE $APPPORT
+
+# 5. start
+CMD ["npm","start"]

Dockerfile.server

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+ARG APPPORT=5000
+FROM --platform=$TARGETPLATFORM node:20-slim
+WORKDIR /app
+COPY package*.json ./
+RUN npm ci --omit=dev --ignore-scripts
+COPY . .
+ENV PORT=5000
+EXPOSE 5000
+CMD ["npm","run","server"]

Dockerfile.server2

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+ARG APPPORT=5001
+FROM --platform=$TARGETPLATFORM node:20-slim
+WORKDIR /app
+COPY package*.json ./
+RUN npm ci --omit=dev --ignore-scripts
+COPY . .
+ENV PORT=5001
+EXPOSE 5001
+CMD ["npm","run","server2"]

Dockerfile.server3

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+ARG APPPORT=5002
+FROM --platform=$TARGETPLATFORM node:20-slim
+WORKDIR /app
+COPY package*.json ./
+RUN apt-get update -y && \
+    apt-get install -y --no-install-recommends python3 git && \
+    rm -rf /var/lib/apt/lists/*
+COPY package*.json ./
+RUN npm ci --omit=dev --ignore-scripts
+COPY . .
+ENV PORT=5002
+EXPOSE 5002
+CMD ["npm","run","server3"]

docker-compose.yml

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+version: "3.9"
+
+services:
+  server:
+    image: us-central1-docker.pkg.dev/aptivaai-dev/aptiva-repo/server:latest
+    restart: unless-stopped
+    ports:
+      - "5000:5000"
+
+  server2:
+    image: us-central1-docker.pkg.dev/aptivaai-dev/aptiva-repo/server2:latest
+    restart: unless-stopped
+    ports:
+      - "5001:5001"
+
+  server3:
+    image: us-central1-docker.pkg.dev/aptivaai-dev/aptiva-repo/server3:latest
+    restart: unless-stopped
+    ports:
+      - "5002:5002"
+
+  nginx:
+    image: nginx:1.27
+    restart: unless-stopped
+    depends_on:
+      - server
+      - server2
+      - server3
+    ports:
+      - "80:80"
+      - "443:443"
+    volumes:
+      - ./nginx.conf:/etc/nginx/nginx.conf:ro

nginx.conf

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+events {}
+http {
+  upstream backend5000 { server server:5000; }
+  upstream backend5001 { server server2:5001; }
+  upstream backend5002 { server server3:5002; }
+
+  server {
+    listen 80;
+    location /api1/ { proxy_pass http://backend5000/; }
+    location /api2/ { proxy_pass http://backend5001/; }
+    location /api3/ { proxy_pass http://backend5002/; }
+  }
+}