initial flake with clan cli and formating

fmt.nix

@@ -0,0 +1,33 @@
+{ inputs, ... }:
+{
+  imports = [ inputs.treefmt-nix.flakeModule ];
+  perSystem =
+    { ... }:
+    {
+      treefmt = {
+        projectRootFile = "flake.nix";
+        programs = {
+          nixfmt.enable = true;
+          prettier.enable = true;
+          yamlfmt.enable = true;
+          shfmt.enable = true;
+        };
+        settings = {
+          on-unmatched = "fatal";
+          global.excludes = [
+            "sops/*"
+            "vars/*"
+
+            "*/.gitignore"
+            "LICENSE"
+
+            "*.tfvars.sops.json"
+            "*nixos-vars.json"
+            "secrets.yaml"
+            "facter.json"
+            "secrets.auto.tfvars.sops.json"
+          ];
+        };
+      };
+    };
+}