Is your feature request related to a problem? Please describe.
A while back we were having problems with the exception handler in Symfony expecting exceptions to have base class Exception, but receiving base class Error instead. So we created docker/app/symfony-exceptions.patch to fix that. Now we may be able to get rid of that rather hacky solution, as it seems that the exceptions PHP ends up throwing are finally going to be base class Exception.

Describe the solution you'd like
Get rid of the hackish symfony-exceptions.patch, finally.

Describe alternatives you've considered
Leaving the file in the repo and just commenting out the Dockerfile line that uses it.