staging: make dir more templaty

staging/README.md

@@ -0,0 +1,7 @@
+# Momo cloud staging infrastructure
+
+This directory contains the host configurations, admin accesses, secrets, and terraform files for the momo cloud staging infrastructure.
+
+We use the staging infrastructure as an example flake that uses the momo cloud flake as an input. The staging infrastructure runs completely on vanilla momo cloud configurations.
+
+You can use the contents of this directory as a basis for your own momo cloud environment.

staging/flake.nix

@@ -75,6 +75,8 @@
               age-plugin-yubikey
               opentofu
               terraform-ls
+              cachix
+              jq
             ];
           };