nixos/traefik: add plugins option to install Nix-managed plugins

[SigmaSquadron]

Things done

• Built on platform:
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• Tested, as applicable:
  • NixOS tests in nixos/tests.
  • Package tests at passthru.tests.
  • Tests in lib/tests or pkgs/test for functions and "core" functionality.
• Ran nixpkgs-review on this PR. See nixpkgs-review usage.
• Tested basic functionality of all binary files, usually in ./result/bin/.
• Nixpkgs Release Notes
  • Package update: when the change is major or breaking.
• NixOS Release Notes
  • Module addition: when adding a new NixOS module.
  • Module update: when the change is significant.
• Fits CONTRIBUTING.md, pkgs/README.md, maintainers/README.md and other READMEs.

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[jackrosenberg]

Will need to test this later, but looks good!

[adamcstephens]

I'd probably suggest waiting a few days, and giving people time to review, before merging something like this.

[jackrosenberg]

I'd probably suggest waiting a few days, and giving people time to review, before merging something like this.

@adamcstephens This isn't master. I asked him to merge both this and other PR's from #436807 :)

[adamcstephens]

I see. Well, it's still not even working, so it's still a bit odd to merge. Traefik is picky about its config, and this breaks configs without plugins.

From nix build -f . traefik.tests

vm-test-run-traefik> traefik # [   17.158990] traefik[1178]: {"level":"error","error":"command traefik error: localPlugins cannot be a standalone element (type map[string]pl

[SigmaSquadron]

Yes, that was the goal of merging it alongside the other PRs. I would never actually merge something as work-in-progress as this into master, which is why the branch is prefixed with wip-. We've also found other issues that can be fixed iteratively.

[SigmaSquadron]

This is slightly more ergonomic than me giving @jackrosenberg commit rights to my Nixpkgs fork and us working outside of the NixOS repo.

[adamcstephens]

Yep. Sorry I missed it wasn’t master. :)