Changed update-ui-assets to push to IoSL

pkgs/ui/nix/update-ui-assets.sh

@@ -17,6 +17,11 @@ if [[ -z "${GITHUB_SERVER_URL:-}" ]]; then
   exit 1
 fi
 
+if [[ -z "${GITHUB_REPOSITORY:-}" ]]; then
+  echo "Env var GITHUB_REPOSITORY is not set. Please use the repo path here."
+  exit 1
+fi
+
 DEPS=$(nix shell --inputs-from '.#' "nixpkgs#gnutar" "nixpkgs#gnused" "nixpkgs#curl" "nixpkgs#gzip" -c bash -c "echo \$PATH")
 export PATH=$PATH:$DEPS