Merge pull request #2487 from uccser/issue/2486 #2256

Job	Run time
Tests - Django system check	2m 35s
Tests - Content	5m 6s
Tests - Documentation	24s
Tests - General	4m 3s
Tests - Management	4m 25s
Tests - Style	4m 26s
Create static files	7m 4s
Create interactive thumbnails (en)	4m 51s
Create interactive thumbnails (de)	4m 41s
Create interactive thumbnails (es)	5m 1s
Create and publish Docker image	1m 32s
	44m 8s

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