Dockerfile based build step?

Seems drone supports image based works only.
If it can support dockerfile based work it would be helpful.

below is example

pipeline:
   dockerfile: Dockerfile.build
  build-arg:
    - GITHUB_USER=my_user
    - GITHUB_TOKEN=my_token
   commad:
    - make

Drone does not currently support this syntax. We do have an open issue you can subscribe to in GitHub for updates: https://github.com/drone/drone/issues/1609#issuecomment-304986851