Provide a medium size image in whitehall image definitions #278

Job	Run time
Test Info Frontend / Run RSpec	4m 25s
Test Info Frontend / Run RSpec	4m 25s
Test Licence Finder / Run RSpec	5m 35s
Test Licence Finder / Run RSpec	5m 35s
Test Manuals Publisher / Run RSpec	6m 49s
Test Manuals Publisher / Run RSpec	6m 49s
Test Publisher / Run Minitest	13m 58s
Test Publisher / Run Minitest	13m 58s
Test Search Admin / Run RSpec	6m 15s
Test Search Admin / Run RSpec	6m 15s
Test Search API / Run RSpec	5m 43s
Test Search API / Run RSpec	5m 43s
Test Service Manual Publisher / Run RSpec	5m 18s
Test Service Manual Publisher / Run RSpec	5m 18s
Test Short URL Manager / Run RSpec	4m 14s
Test Short URL Manager / Run RSpec	4m 14s
Test Smart Answers / Run Minitest	9m 35s
Test Smart Answers / Run Minitest	4m 49s
Test Specialist Publisher / Run RSpec	5m 54s
Test Specialist Publisher / Run RSpec	5m 54s
Test Travel Advice Publisher / Run RSpec	7m 18s
Test Travel Advice Publisher / Run RSpec	7m 18s
Test Whitehall / minitest-matrix (4, 0)	8m 1s
Test Whitehall / minitest-matrix (4, 0)	8m 1s
Test Whitehall / minitest-matrix (4, 1)	8m 50s
Test Whitehall / minitest-matrix (4, 1)	8m 50s
Test Whitehall / minitest-matrix (4, 2)	8m 12s
Test Whitehall / minitest-matrix (4, 2)	8m 12s
Test Whitehall / minitest-matrix (4, 3)	8m 24s
Test Whitehall / minitest-matrix (4, 3)	8m 24s
Test Whitehall / Run Minitest	3s
Test Whitehall / Run Minitest	3s
	3h 32m 22s

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