How can I set host ssh key?

Drone Support
1

First hello everyone.
I use drone for PHP/js builds and deployment. Deployment with deployer, for this I create docker image https://hub.docker.com/r/vertoo/deployer. To deploy I need ssh key from host but I not found any working solution.
Tried few solutions, always I had problem. What is proper way to share host ssh key to docker image in drone?

2

Found solution:

- name: deploy
  image: vertoo/deployer
  environment:
    SSH_KEY:
      from_secret: ssh_key
  commands:
    - echo "$SSH_KEY" > $HOME/.ssh/id_rsa
    - chmod 600 $HOME/.ssh/id_rsa
    - /usr/local/bin/dep deploy test
  when:
    branch:
      - master