Start collecting CRDs with nix

[UnstoppableMango]

• Move flack check and nix files
• WIP
• Flake update
• MORE
• Even MORE crds

[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Introduces a new flux flake-parts module for validating Flux configs and generating/collecting CRDs via Nix, and wires in nix-kube-generators for Kubernetes/YAML/Helm tooling.

Changes:

• Add ./flux flake-parts module with packages + checks (flux validation, CRD collection).
• Add CRD assembly pipeline (fetch/build Helm charts, slice CRDs, symlink results).
• Update flake inputs to include nix-kube-generators and expose kubelib via legacyPackages.

Reviewed changes

Copilot reviewed 4 out of 7 changed files in this pull request and generated 5 comments.

File	Description
flux/src.nix	Defines a source fileset for Flux-related evaluation/build inputs
flux/default.nix	Adds per-system Flux packages and a validate-flux check
flux/crds.nix	Implements fetching/building and slicing CRDs into a joined output
flake.nix	Registers the flux module, adds nix-kube-generators, and exposes kubelib