feat: add support for building kopium

Kopium is a handy tool for generating rust data structures from
kubernetes CRDs.

Signed-off-by: Daniel Noland <daniel@githedgehog.com>

Author: daniel-noland

default.nix

@@ -48,6 +48,10 @@ rec {
     cargo-nextest = fancy.rustOverrides super.cargo-nextest;
     csview = fancy.rustOverrides super.csview;
     just = fancy.rustOverrides super.just;
+    kopium = fancy.rustOverrides (self.callPackage ./nix/kopium {
+       rev = "c4931d13043994813c9949d90bf3e0fbac949148"; # 0.22.5
+       hash = "sha256-zYmb+HxwEKEnzdqAzvki5M+NA2fGP174pRkU6B4WmZI=";
+    });
     frr-agent = fancy.rustOverrides (
       self.callPackage ./nix/frr-agent {
         rev = versions.frr-agent.rev;

nix/kopium/default.nix

@@ -0,0 +1,17 @@
+{
+  rustPlatform,
+  fetchFromGitHub,
+  rev,
+  hash,
+}:
+rustPlatform.buildRustPackage (finalAttrs: {
+  pname = "kopium";
+  version = rev;
+  src = fetchFromGitHub {
+    owner = "kube-rs";
+    repo = finalAttrs.pname;
+    inherit rev hash;
+  };
+  cargoLock.lockFile = "${finalAttrs.src}/Cargo.lock";
+  cargoHash = hash;
+})