fix: don't do check on all builds

Checks can be done with `nix flake check`, no need to slow down build process with this.

nix/packages/continuwuity.nix

@@ -34,6 +34,7 @@ let
       rustPlatform.bindgenHook
     ];
     buildInputs = lib.optionals stdenv.hostPlatform.isLinux [ liburing ];
+    doCheck = false;
     env = {
       CARGO_PROFILE = profile;
       RUSTFLAGS = rustflags;