investigate slurm and nix-scheduler-hook

[zowoq]

https://discourse.nixos.org/t/introducing-nix-scheduler-hook-a-build-hook-for-sending-builds-to-job-schedulers/73038

https://github.com/lisanna-dettwyler/nix-scheduler-hook

Another option may be adapting https://github.com/helsinki-systems/hydra-queue-runner so it isn't hydra specific.

[Mic92]

lisanna-dettwyler/nix-scheduler-hook#8