Add optional "precache" flag #313

Job	Run time
lint_shellcheck	3s
test_cache (ubuntu-latest)	20s
test_cache (windows-latest)	1m 8s
test_channel (ubuntu-latest, stable)	39s
test_cache (macos-latest)	56s
test_cache (macos-13)	1m 11s
test_channel (ubuntu-latest, beta)	40s
test_cache (macos-14)	29s
test_channel (ubuntu-latest, master)	39s
test_channel (windows-latest, stable)	1m 38s
test_precache	25s
test_channel (windows-latest, beta)	1m 38s
test_print_output	21s
test_channel (windows-latest, master)	1m 39s
test_channel (macos-latest, stable)	1m 6s
test_channel (macos-latest, beta)	1m 13s
test_channel (macos-latest, master)	1m 27s
test_channel (macos-13, stable)	1m 13s
test_channel (macos-13, beta)	1m 3s
test_channel (macos-13, master)	1m 2s
test_channel (macos-14, stable)	42s
test_channel (macos-14, beta)	38s
test_channel (macos-14, master)	41s
test_channel (ubuntu-latest, main)	40s
	21m 31s

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