fix: quiet pushd and popd

plugins/apps/subcommands/clone

@@ -21,9 +21,9 @@ apps_clone_cmd() {
   local NEW_CACHE_DIR="$DOKKU_ROOT/$NEW_APP/cache"
 
   apps_create "$NEW_APP"
-  pushd "$DOKKU_ROOT/$OLD_APP/."
+  pushd "$DOKKU_ROOT/$OLD_APP/." > /dev/null
   find ./* -not \( -name .cache \) | cpio -pvdmu "$DOKKU_ROOT/$NEW_APP"
-  popd
+  popd > /dev/null
 
   if [[ -d "$NEW_CACHE_DIR" ]] && ! rmdir "$NEW_CACHE_DIR"; then
     docker run "$DOKKU_GLOBAL_RUN_ARGS" --rm -v "$NEW_CACHE_DIR:/cache" "dokku/$OLD_APP" chmod 777 -R /cache