Deploy by role does not work about kamal

[argia-andreas]

For additional context:
This seems to be due to initial container healthcheck step which is performed with the primary role.

kamal deploy -r secondary-role

Ensure app can pass healthcheck...
  INFO [703ee48c] Running docker run --detach --name healthcheck-primary-role --publish 3999:80 --label service=healthcheck-primary-role -e KAMAL_CONTAINER_NAME="healthcheck-primary-role" --env-file .kamal/env/roles/primary-role.env --health-cmd "curl -f http://localhost/up || exit 1"
  INFO [a8ccc7f3] Finished in 0.075 seconds with exit status 123 (failed).
Releasing the deploy lock...
  Finished all in 22.6 seconds
  ERROR (SSHKit::Command::Failed): Exception while executing on host 192.168.0.11: docker exit status: 125
docker stdout: Nothing written
docker stderr: docker: open .kamal/env/roles/primary-role.env: no such file or directory.

[djmb]

This should be fixed by #740