Optimize submission detail query (#4762) #3503

Job	Run time
Check frontend needs building	12s
Check backend needs building	15s
Check pretix needs building	9s
Build pretix	0s
Build backend / Build	2m 32s
Deploy backend	43s
Wait backend deployment	2m 7s
Deploy frontend	1m 9s
Build frontend	0s
Wait frontend deployment	13s
	7m 20s

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