Handle book directory name case variability #570

Job	Run time
Build API image	5m 35s
Build API image	5m 35s
Build Frontend image	1m 29s
Build Frontend image	1m 29s
Test Frontend image	4m 36s
Test Frontend image	4m 36s
Test API image	25m 51s
Test API image	41m 52s
Push images if this is a branch	0s
Push images if this is a branch	0s
Develop deploy on successful develop build	0s
Develop deploy on successful develop build	0s
	1h 31m 3s

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