add devenv, cachix

[jaysa68]

No description provided.

[dotlambda]

This means trusting https://devenv.cachix.org for any substitution, i.e., any package can be fetched from there. I assume that's fine because domenkozar is trustworthy but we might prefer hosting our own cache using e.g. https://github.com/zhaofengli/attic. That way we could also cache other builds people want to have easy access to.
EDIT: Actually, if we use trusted-substitutors it will only be used if someone explicitly enables it. See https://nix.dev/manual/nix/2.32/command-ref/conf-file.html#conf-trusted-substituters. But that still means technically any package can be fetched from there by untrusted users who run nix build etc. on an OCF machine.

[jaysa68]

ok, im down to give attic a shot and work on a local cache later, but for now, it is pretty nice to have devshells build quickly on desktops...

[dotlambda]

Sounds good!
I've never used devenv. Do you know what it is that is cached on cachix? I'm sure you can put together your own devenvs that won't be cached.

devenv.cachix.org is added to the list of pull caches by default.

It mirrors the official NixOS cache and is designed to provide caching for the devenv-nixpkgs/rolling nixpkgs input.¹

actually sounds like it wouldn't cache anything new.

Footnotes

1. https://devenv.sh/binary-caching/ ↩