Add optional "precache" flag #312

Job	Run time
lint_shellcheck	6s
test_channel (ubuntu-latest, stable)	38s
test_cache (ubuntu-latest)	13s
test_channel (ubuntu-latest, beta)	37s
test_cache (windows-latest)	1m 3s
test_channel (ubuntu-latest, master)	40s
test_precache	21s
test_cache (macos-latest)	1m 32s
test_channel (windows-latest, stable)	1m 59s
test_cache (macos-13)	53s
test_channel (windows-latest, beta)	1m 34s
test_print_output	15s
test_cache (macos-14)	33s
test_channel (windows-latest, master)	1m 27s
test_channel (macos-latest, stable)	1m 37s
test_channel (macos-latest, beta)	59s
test_channel (macos-latest, master)	1m 8s
test_channel (macos-13, stable)	1m 0s
test_channel (macos-13, beta)	1m 1s
test_channel (macos-13, master)	1m 0s
test_channel (macos-14, stable)	1m 20s
test_channel (macos-14, beta)	54s
test_channel (macos-14, master)	36s
test_channel (ubuntu-latest, main)	40s
	22m 6s

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