Dockerfile

FROM node:22-bookworm-slim

ARG LEGO_VERSION=v4.31.0
ARG TARGETARCH

ENV NODE_ENV=production \
    ELEC_HOST=0.0.0.0 \
    ELEC_PORT=3210 \
    ELEC_AUTO_OPEN=false \
    ELEC_LEGO_BINARY_PATH=/usr/local/bin/lego

WORKDIR /app

RUN apt-get update \
  && apt-get install -y --no-install-recommends ca-certificates curl tar \
  && rm -rf /var/lib/apt/lists/*

RUN case "${TARGETARCH}" in \
      "amd64") LEGO_ARCH="amd64" ;; \
      "arm64") LEGO_ARCH="arm64" ;; \
      *) echo "Unsupported TARGETARCH: ${TARGETARCH}" && exit 1 ;; \
    esac \
  && curl -fsSL "https://github.com/go-acme/lego/releases/download/${LEGO_VERSION}/lego_${LEGO_VERSION}_linux_${LEGO_ARCH}.tar.gz" \
    | tar -xz -C /usr/local/bin lego \
  && chmod +x /usr/local/bin/lego

COPY package.json package-lock.json ./
RUN npm ci --omit=dev --cache .npm-cache \
  && npm cache clean --force

COPY src ./src
COPY README.md ./README.md

EXPOSE 3210
VOLUME ["/app/.elec-data"]

HEALTHCHECK --interval=30s --timeout=5s --start-period=20s --retries=3 \
  CMD node -e "fetch('http://127.0.0.1:' + (process.env.ELEC_PORT || 3210) + '/api/health').then((res) => process.exit(res.ok ? 0 : 1)).catch(() => process.exit(1))"

CMD ["npm", "start"]