services:
  backup:
    image: postgres:17.7-alpine
    environment:
      PGHOST: ${DB_HOST}
      PGPORT: ${DB_PORT}
      PGDATABASE: ${DB_NAME}
      PGUSER: ${DB_USER}
      PGPASSWORD: ${DB_PASSWORD}
    entrypoint: ["pg_dump"]
    command:
      - "--format=custom"
      - "--no-owner"
      - "--no-privileges"
      - "--file=/backup/current.dump"
    volumes:
      - ${BACKUP_DIR}:/backup