Increase ECS heavy processing worker storage to 800GB #3282

Job	Run time
Check pretix needs building	8s
Check frontend needs building	11s
Check backend needs building	11s
Build pretix	0s
Build backend / Build	6m 50s
Deploy backend	37s
Wait backend deployment	1m 20s
Build frontend	0s
Deploy frontend	36s
Wait frontend deployment	9s
	10m 2s

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