Fix NLTK data PermissionError in Docker (#4575) #3403

Job	Run time
Check backend needs building	13s
Check frontend needs building	9s
Check pretix needs building	10s
Build pretix	-1s
Build backend / Build	5m 1s
Deploy backend	37s
Wait backend deployment	2m 49s
Deploy frontend	45s
Build frontend	0s
Wait frontend deployment	9s
	9m 52s

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