add a shim to provide nixosConfigurations from colmena hive

flake.nix

@@ -20,7 +20,7 @@
     lix.follows = "hydra/nix";
   };
 
-  outputs = { self, nixpkgs, terranix, ... } @ inputs:
+  outputs = { self, nixpkgs, terranix, colmena, ... } @ inputs:
   let
     system = "x86_64-linux";
     pkgs = import nixpkgs {
@@ -67,6 +67,8 @@
       ];
     };
 
+    nixosConfigurations = (colmena.lib.makeHive self.outputs.colmena).nodes;
+
     colmena = {
       meta.nixpkgs = import nixpkgs {
         localSystem = system;