FROM alpine:edge

RUN apk add --no-cache \
    nodejs \
    npm \
    docker-cli \
    tzdata \
    bash

WORKDIR /app

COPY balance.js .

RUN npm install --no-package-lock --omit=dev \
    axios \
    dockerode \
    commander \
    && npm cache clean --force

# NOTE: running as root so the container can read /var/run/docker.sock.
# The balancer is a tiny orchestration script; root here is acceptable.
# (If you prefer non-root, see Option B or C.)

ENV OFELIA_PORT=8080 \
    NODE_ENV=production

CMD ["node", "balance.js", "--interval", "60", "--apply"]