[webhook] Updates the NPM install hooks to do a new directory on each deploy. Clean will come later

system/hosts/mcp/static-site-hooks.nix

@@ -28,6 +28,8 @@ let
         id
         pwd
 
+        output_dir=$(date --utc --iso-8601=seconds)
+
         export GIT_SSH_COMMAND='ssh -v -o "UserKnownHostsFile ${gitKnownHosts}" -i "${
           config.sops.secrets."deploy-key/mcp".path
         }"'
@@ -43,7 +45,8 @@ let
 
         # Use a local cache with --cache .npm
         npm ci --cache .npm
-        npm run build
+        npm run build -- --outDir "$output_dir"
+        ln -s "$output_dir" deployed
       '';
     };
 in