# ---------- 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"]