Add option to disable caching in setup action #343

Job	Run time
static	1m 0s
test (docs)	3m 28s
test (examples)	2m 33s
test (test, test local var val, --test-arg --test-arg)	1m 42s
test (remote, 0)	4m 0s
test (remote-test, remote-test, 1)	4m 3s
test (test-coverage, test local var val, --test-arg, test-coverage)	1m 27s
test (test-coverage, test local var val, --test-arg, 3.8, ubuntu-20.04, test-coverage-oldest)	1m 20s
test (test-nengo, test local var val, --test-arg, 3.11)	1m 32s
coverage	49s
deploy	0s
auto-update	0s
	21m 54s

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