[AssetMapper] importmap:install silently fail but say everything is ok on prod

[zorn-v]

Symfony version(s) affected

6.4.6

Description

If you have no permissions to write to assets directrory you'll just get a php warning in prod enviroment (as warnings does not converts to exceptions there).
It is not right to say "all right" when it is not I think. And return exit code 0. bash scripts with set -e continue executing with not installed assets in CI (for example). Good that assets:compile throw exeption like "you did not run importmap:install", but problem was in another place.

21:14:28 WARNING   [php] Warning: file_put_contents(/var/www/html/assets/vendor/installed.php): Failed to open stream: No such file or directory ["exception" => ErrorException { …}]

                                                                                                                        
 [OK] Downloaded 1 package into assets/vendor.                                                                          
                                                                                                                        

How to reproduce

./bin/console imp:req bootstrap
rm -rf assets/vendor
echo 'APP_ENV=prod' >> .env.local
chmod 555 assets
./bin/console imp:inst

Possible Solution

Check that downloded package exists and throw exception otherwise.

Additional Context