Prioritise Mastodon over Twitter (#4365) #3306

Job	Run time
Check frontend needs building	10s
Check pretix needs building	14s
Check backend needs building	11s
Build backend	0s
Deploy backend	33s
Build pretix	0s
Wait backend deployment	10s
Build frontend / Build	4m 49s
Deploy frontend	37s
Wait frontend deployment	50s
	7m 34s

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