way-displays: init module

[jolars]

Description

Adds support for a service using way-displays, which is an alternative to kanshi for managing display configurations on wlroots-based wayland compositors.

Closes #6787

Checklist

• Change is backwards compatible.

• Code formatted with ./format.

• Code tested through nix-shell --pure tests -A run.all
  or nix build --reference-lock-file flake.lock ./tests#test-all using Flakes.

• Test cases updated/added. See example.

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Maintainer CC

[jolars]

If I understand correctly, the error is related to the news file. I'm not quite sure what I did wrong there. Anyone know?

[jolars]

If I understand correctly, the error is related to the news file. I'm not quite sure what I did wrong there. Anyone know?

Okay, I may have solved it now. pkgs wasn't inherited if the news nix file was a function, so this failed because of condition = pkgs.stdenv.hostPlatform.isLinux;, with { pkgs, ...}: at the top.

I've included the fix here in this PR, but maybe you'd prefer if I separated it out? @rycee

[jolars]

Thanks for the review, @khaneliman!