Show speaker availability in schedule builder (#4588) #3408

Job	Run time
Check backend needs building	13s
Check pretix needs building	13s
Check frontend needs building	13s
Build backend / Build	7m 51s
Build pretix	0s
Deploy backend	41s
Wait backend deployment	2m 34s
Build frontend	0s
Deploy frontend	43s
Wait frontend deployment	10s
	12m 38s

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