Add CORS rule to the Pretix s3 media bucket (#4422) #3262

Job	Run time
Check pretix needs building	11s
Check backend needs building	10s
Check frontend needs building	11s
Build backend	0s
Build pretix	0s
Deploy backend	39s
Wait backend deployment	16s
Deploy frontend	39s
Build frontend	0s
Wait frontend deployment	11s
	2m 17s

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