feat: interface and lib refactoring

lib/k8s.nix

@@ -0,0 +1,54 @@
+{ lib }:
+
+with lib;
+
+rec {
+  mkSecretOption = {description ? "", default ? null}: mkOption {
+    inherit description;
+    type = types.nullOr (types.submodule {
+      options = {
+        name = mkOption {
+          description = "Name of the secret where secret is stored";
+          type = types.str;
+        };
+
+        key = mkOption {
+          description = "Name of the key where secret is stored";
+          type = types.str;
+        };
+      };
+
+      config = mkDefault (if default == null then {} else default);
+    });
+    default = {};
+  };
+
+  secretToEnv = value: {
+    valueFrom.secretKeyRef = {
+      inherit (value) name key;
+    };
+  };
+
+  # Creates kubernetes list from a list of kubernetes objects
+  mkList = { items, labels ? {} }: {
+    kind = "List";
+    apiVersion = "v1";
+
+    inherit items labels;
+  };
+
+  # Creates hashed kubernetes list from a list of kubernetes objects
+  mkHashedList = { items, labels ? {} }: let
+    hash = builtins.hashString "sha1" (builtins.toJSON items);
+
+    labeledItems = map (item: recursiveUpdate item {
+      metadata.labels."kubenix/hash" = hash;
+    }) items;
+
+  in mkList {
+    items = labeledItems;
+    labels = {
+      "kubenix/hash" = hash;
+    } // labels;
+  };
+}