https://releases.nixos.org/nixops/nixops-1.7/manual/manual.html

2020
https://christine.website/blog/nixops-services-2020-11-09
Lindberger - NixOps
    https://www.youtube.com/watch?v=SoHtccHNOJ8
    ! need to look

keys management
https://releases.nixos.org/nixops/nixops-1.7/manual/manual.html#idm140737322342384