Add a GitHub Action for tests against PHP 8.1
Add a GitHub Action for tests against PHP 8.1

sgehrig/symfony,HeahDude/symfony,curry684/symfony,symfony/symfony,stof/symfony,Slamdunk/symfony,mpdude/symfony,Tobion/symfony,hhamon/symfony,sgehrig/symfony,symfony/symfony,curry684/symfony,Slamdunk/symfony,ogizanagi/symfony,d-ph/symfony,paradajozsef/symfony,ro0NL/symfony,HeahDude/symfony,d-ph/symfony,hhamon/symfony,Tobion/symfony,curry684/symfony,ogizanagi/symfony,phramz/symfony,nicolas-grekas/symfony,sgehrig/symfony,damienalexandre/symfony,damienalexandre/symfony,ro0NL/symfony,ogizanagi/symfony,Taluu/symfony,Slamdunk/symfony,mpdude/symfony,ro0NL/symfony,oleg-andreyev/symfony,xabbuh/symfony,phramz/symfony,xabbuh/symfony,nicolas-grekas/symfony,tucksaun/symfony,zerkms/symfony,mpdude/symfony,hhamon/symfony,nicolas-grekas/symfony,derrabus/symfony,tucksaun/symfony,d-ph/symfony,hhamon/symfony,ro0NL/symfony,derrabus/symfony,damienalexandre/symfony,curry684/symfony,Tobion/symfony,stof/symfony,paradajozsef/symfony,d-ph/symfony,Taluu/symfony,sgehrig/symfony,Tobion/symfony,tucksaun/symfony,zerkms/symfony,mpdude/symfony,ogizanagi/symfony,oleg-andreyev/symfony,symfony/symfony,HeahDude/symfony,damienalexandre/symfony,oleg-andreyev/symfony,stof/symfony,xabbuh/symfony,stof/symfony,paradajozsef/symfony,symfony/symfony,oleg-andreyev/symfony,xabbuh/symfony,Taluu/symfony,paradajozsef/symfony,Slamdunk/symfony,phramz/symfony,derrabus/symfony,zerkms/symfony,nicolas-grekas/symfony,derrabus/symfony,HeahDude/symfony,Taluu/symfony,tucksaun/symfony,zerkms/symfony,phramz/symfony