Add tickets link in the header (#4503) #3340

Job	Run time
Check pretix needs building	11s
Check frontend needs building	14s
Check backend needs building	10s
Build pretix	0s
Build backend	-1s
Deploy backend	33s
Wait backend deployment	10s
Build frontend / Build	4m 2s
Deploy frontend	42s
Wait frontend deployment	1m 7s
	7m 8s

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