refator: put all modules under modules directory

modules/k8s/submodule.nix

@@ -0,0 +1,59 @@
+{ config, lib, kubenix, ... }:
+
+with lib;
+
+let
+  globalConfig = config;
+in {
+  imports = [ kubenix.submodules ];
+
+  options = {
+    kubernetes.propagateDefaults = mkOption {
+      description = "Whether to propagate child defaults to submodules";
+      type = types.bool;
+      default = true;
+    };
+
+    submodules.instances = mkOption {
+       type = types.attrsOf (types.submodule ({config, ...}: {
+        options = {
+          namespace = mkOption {
+            description = "Default kubernetes namespace";
+            type = types.str;
+            default = "default";
+          };
+        };
+
+        config.config = {
+          kubernetes.api.defaults = [{
+            default.metadata.namespace = mkDefault config.namespace;
+          }];
+        };
+      }));
+    };
+  };
+
+  config = {
+    submodules.defaults = [{
+      default = {
+        imports = [ kubenix.k8s ];
+        kubernetes.version = mkDefault config.kubernetes.version;
+        kubernetes.api.defaults =
+          mkIf config.kubernetes.propagateDefaults config.kubernetes.api.defaults;
+      };
+    } {
+      default = ({config, ...}: {
+        kubernetes.api.defaults = [{
+          default.metadata.labels = {
+            "kubenix/module-name" = config.submodule.name;
+            "kubenix/module-version" = config.submodule.version;
+          };
+        }];
+      });
+    }];
+
+    kubernetes.objects = mkMerge (mapAttrsToList (_: submodule:
+      submodule.config.kubernetes.objects
+    ) config.submodules.instances);
+  };
+}