Modules: Add agenix module

home/modules/agenix/options.nix

@@ -0,0 +1,33 @@
+{
+  lib,
+  mylib,
+  ...
+}: let
+  mkSecret = file:
+    lib.mkOption {
+      type = lib.types.path;
+      default = file;
+    };
+in {
+  secrets = lib.mkOption {
+    type = lib.types.attrs;
+    description = "The secret files managed by agenix (and their associated keys)";
+    example = ''
+      {
+        christoph = [
+          "heidi-discord-token"
+          "kopia-password"
+          "kopia-server-username"
+          "kopia-server-password"
+        ];
+      }
+    '';
+
+    default = {};
+  };
+
+  heidi-discord-token = mkSecret ./heidi-discord-token.age;
+  kopia-user-password = mkSecret ./kopia-user-password.age;
+  kopia-server-user = mkSecret ./kopia-server-user.age;
+  kopia-server-password = mkSecret ./kopia-server-password.age;
+}