drone docker plugins with layers cache

.drone.yml

pipeline:
  restore-cache:
    image: drillster/drone-volume-cache
    restore: true
    ttl: 7
    mount:
      - /drone/docker
    # Mount the cache volume, needs "Trusted"
    volumes:
      - /tmp/cache:/cache

  build-php:
    image: plugins/docker
    repo: 4real/skins-php
    tags: [ 1, latest ]
    storage_path: /drone/docker
    dockerfile: docker/php/Dockerfile
    secrets: [ docker_username, docker_password ]

  rebuild-cache:
    image: drillster/drone-volume-cache
    rebuild: true
    mount:
      - /drone/docker
    # Mount the cache volume, needs "Trusted"
    volumes:
      - /tmp/cache:/cache