Allow setting room sizes from the room (#4594) #3415

Job	Run time
Check backend needs building	11s
Check frontend needs building	12s
Check pretix needs building	12s
Build backend / Build	8m 29s
Build pretix	-1s
Deploy backend	39s
Wait backend deployment	2m 50s
Deploy frontend	40s
Build frontend	0s
Wait frontend deployment	12s
	13m 24s

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