universeair: Brew fix

machines/universeair/configuration.nix

@@ -24,6 +24,11 @@ in
         programs.bash.enable = true;
         programs.zsh = {
           enable = true;
+          initExtra = ''
+            if [[ $(uname -m) == 'arm64' ]]; then
+                 eval "$(/opt/homebrew/bin/brew shellenv)"
+            fi
+          '';
           shellAliases = {
             ssh = "kitty +kitten ssh";
             sshu = "ssh universe";
@@ -66,6 +71,9 @@ in
       # It is not installed by nix, for now, so manually install:
       # https://brew.sh/
       enable = true;
+      onActivation = {
+        cleanup = "uninstall";
+      };
       # Graphical apps to install through homebrew instead of nixpkgs
       casks = [
         "firefox"