added sops secrets

flake.nix

@@ -8,6 +8,12 @@
     # flake parts
     flake-parts.url = "github:hercules-ci/flake-parts";
     import-tree.url = "github:vic/import-tree";
+
+    # secret management
+    sops-nix = {
+      url = "github:Mic92/sops-nix";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
   };
 
   outputs = inputs: inputs.flake-parts.lib.mkFlake {inherit inputs;} (inputs.import-tree ./modules);