Phras 2836 xdebug

[AlexandreBrach]

• PHRAS-2836: add xdebug on docker multistage building

[jygaulier]

Could not make debugging ok, I tried mix of

• harcoded port mapping (9011->9021)
• id mapping (9011->9011)
• hardcoded ports (9001, 9011, ...) without mapping
• adding lines to xdebug.ini, checked ok with php -i

With mapping, phpstorm complains "port is busy" while activating the listener.
Without mapping, the listener waits for connection, but no stop on breakpoints.

I then made a poc by following the lightest method described in https://dev.to/_mertsimsek/using-xdebug-with-docker-2k8o, except I did not install a whole symfony app, but a single phpinfo() page.
It works, breakpoints are ok, so I tried with mapping :

• With any mapping, including id mapping (9011->9021 ; 9011->9011), phpstorm says "port is busy".
• Without mapping, trying port 9001, 9011, 9021 : all ok.

So 2 ways to go on :

• try to fix not-ok phraseanet/docker, until ok.
• change ok poc step by step to phraseanet direction (pb due to multi containers ?) until not-ok-anymore.