How can I copy files and change owner?

Drone Support
1

I have this step in my config:

  publish-docs:
    image: rust
    group: deploy
    commands:
      - cargo doc
      - cp target/doc/* -R /deploy-docs/
    volumes:
      - /var/www/docs/stonedguy-ci:/deploy-docs/

But when the files are copied there, they have root as owner and so I have problems with it because files there must not have root rights. How can I change the user to my host-machine’s nginx user during deployment?