Docker composer to install heartbeat for healthchecks.io

services:
  heartbeat:
    image: curlimages/curl:latest
    container_name: heartbeat
    entrypoint: ["/bin/sh", "-c"]
    command:
      - |
        while true; do
          curl --fail --silent --show-error \
            --max-time 10 --retry 2 \
            "$${PING_URL}" || true
          sleep 60
        done
    environment:
      PING_URL: "${HEARTBEAT_URL}"
    restart: unless-stopped
    init: true
    read_only: true
    cap_drop:
      - ALL
    security_opt:
      - no-new-privileges:true