move inherits and add attrset for imports

hosts/default.nix

@@ -0,0 +1,16 @@
+# Return a list of all hosts
+
+{ lib, ... }:
+
+lib.pipe (lib.filesystem.listFilesRecursive ./.) [
+  # Get only files ending in default.nix
+  (builtins.filter (name: lib.hasSuffix "default.nix" name))
+  # Import each host function
+  map
+  (file: {
+    name = builtins.baseNameOf (builtins.dirOf file);
+    value = import file;
+  })
+  # Convert to an attrset of hostname -> host function
+  (builtins.listToAttrs)
+]