cli: add morph command

nixosModules/clanCore/vars/secret/fs.nix

@@ -0,0 +1,17 @@
+{
+  config,
+  lib,
+  ...
+}:
+{
+  config.clan.core.vars.settings = lib.mkIf (config.clan.core.vars.settings.secretStore == "fs") {
+    fileModule = file: {
+      path =
+        if file.config.neededFor == "partitioning" then
+          throw "${file.config.generatorName}/${file.config.name}: FS backend does not support partitioning."
+        else
+          "/run/secrets/${file.config.generatorName}/${file.config.name}";
+    };
+    secretModule = "clan_cli.vars.secret_modules.fs";
+  };
+}