Add option to disable caching in setup action #342

Job	Run time
static	2m 29s
test (docs)	3m 8s
test (examples)	3m 52s
test (test, test local var val, --test-arg --test-arg)	1m 55s
test (remote, 0)	1m 20s
test (remote-test, remote-test, 1)	1m 14s
test (test-coverage, test local var val, --test-arg, test-coverage)	2m 38s
test (test-coverage, test local var val, --test-arg, 3.8, ubuntu-20.04, test-coverage-oldest)	1m 11s
test (test-nengo, test local var val, --test-arg, 3.11)	3m 8s
coverage	43s
auto-update	0s
deploy	0s
	21m 38s

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