Packagist blocks requests with Repman user agent

[SavuBogdan]

any request to download the jsons from packagist like this one are blocked

https://packagist.org/p2/psr/log~dev.json

if the User agent header contains the string Repman/ you get a 403 forbidden code.

The header is hardcoded in the code in the ReactDownloader class and we can't disable it from env we have to rebuild images to make them work again for proxy

[naderman]

This project appears to be unmaintained and hasn't seen changes in years. Please do not just change the user agent, we may end up having to block you on packagist.org again, because repman.io is both making requests to wrong endpoints but also not caching properly leading to massive bandwidth use on packagist.org: See our issue at #695