step下的volumes和根部的volumes有什么联系吗？为什么要写两个

steps:

  - name: build

    image: plugins/docker

    volumes:

      - name: hosts

        path: /etc/hosts #drone所在服务器要配好harbor的主机名和ip映射

      - name: docker-ca

        path: /etc/docker

      - name: dockersock

        path: /var/run/docker.sock

和

volumes:

  - name: hosts

    host:

      path: /etc/hosts

  - name: docker-ca

    host:

      path: /etc/docker

  - name: dockersock

    host:

      path: /var/run/docker.sock