feat(monitoring): expose prom/am via sso (#987)

diff --git a/flake.nix b/flake.nix
index d00bebc..0b7613a 100644
--- a/flake.nix
+++ b/flake.nix
@@ -17,6 +17,7 @@
             buildInputs = with pkgs; [
               earthly
               go
+              kubernetes-helm
               nixpkgs-fmt
               poetry
               vendir