fix(magnum): add missing helm image
diff --git a/shell.nix b/shell.nix
index 28966f9..9b81adb 100644
--- a/shell.nix
+++ b/shell.nix
@@ -2,6 +2,7 @@
 
 pkgs.mkShell {
   packages = with pkgs; [
+    pkgs.earthly
     pkgs.poetry
   ];
 }