[Routing][FrameworkBundle] Allow using env() in route conditions

[fabpot]

Q	A
Feature PR	symfony/symfony#35747
PR author(s)	@atailouloute
Merged in	5.1-dev

[nicolas-grekas]

This PR also introduces the routing.expression_language_function tag, which is a new capability on its own.

[carsonbot]

Thank you for this issue.
There has not been a lot of activity here for a while. Has this been resolved?

[carsonbot]

Could I get an answer? If I do not hear anything I will assume this issue is resolved or abandoned. Please get back to me <3

[carsonbot]

Hey,

I didn't hear anything so I'm going to close it. Feel free to comment if this is still relevant, I can always reopen!