fix: Add relative_path to cache key #37

Job	Run time
Tests (0-2)	9m 50s
Test build docker image	17m 41s
Lint code	1m 59s
Tests (1-2)	7m 10s
System tests (0-4)	11m 49s
System tests (1-4)	12m 31s
TODO	12s
System tests (2-4)	7m 17s
System tests (3-4)	9m 55s
Build and push image to Registry	0s
Generate release	0s
	1h 18m 24s

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