feat(ops/irccat): Add a NixOS module for launching irccat r/1875

This module configures irccat by creating a JSON configuration file
from a user-supplied Nix struct (this is not checked for correctness),
and merging it recursively with secrets from
`/etc/secrets/irccat.json` at service launch time.

This way we get the ability to configure (most) options declaratively
via Nix, while providing the secrets outside of Nix.

Side note: We need to figure out a secrets distribution mechanism.

Tested: Wrote a dummy config in whitby/default.nix locally and checked
that this builds, but I have not actually run the service yet. I
expect that some minor tweaks will end up being necessary.

Change-Id: I02a2e8dc40a7f8417fd77afcf8a12ac3df117988
Reviewed-on: https://cl.tvl.fyi/c/depot/+/2074
Tested-by: BuildkiteCI
Reviewed-by: lukegb <lukegb@tvl.fyi>
Reviewed-by: glittershark <grfn@gws.fyi>

0 files changed, 0 insertions, 0 deletions