Merge pull request #2489 from uccser/issue/1833 #2269

Job	Run time
Tests - Django system check	2m 21s
Tests - Documentation	13s
Tests - Content	4m 59s
Tests - General	3m 57s
Tests - Management	4m 22s
Tests - Style	3m 39s
Create static files	7m 0s
Create interactive thumbnails (en)	4m 41s
Create interactive thumbnails (de)	4m 20s
Create interactive thumbnails (es)	4m 19s
Create and publish Docker image	1m 3s
	40m 54s

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