wip(ci): only unpack for relevant flagged platforms #264

Job	Run time
create_pre_release	4s
prebuild (20, macos-14)	1m 2s
prebuild (20, macos-12)	1m 11s
prebuild (20, ubuntu-latest)	8m 54s
prebuild (20, windows-latest)	5m 2s
test (macos-14, amd64, 16)	18s
test (macos-12, arm64, 16)	22s
test (windows-latest, amd64, 16)	33s
test (ubuntu-latest, amd64, false, false, 16)	40s
test (ubuntu-latest, arm64, false, true, 16)	12m 32s
test (ubuntu-latest, arm64, true, true, 16)	2m 50s
test (ubuntu-latest, amd64, true, true, 16)	52s
test (macos-14, amd64, 18)	22s
test (macos-12, arm64, 18)	18s
test (windows-latest, amd64, 18)	25s
test (ubuntu-latest, amd64, false, false, 18)	39s
test (ubuntu-latest, arm64, false, true, 18)	6m 55s
test (ubuntu-latest, arm64, true, true, 18)	6m 14s
test (ubuntu-latest, amd64, true, true, 18)	1m 0s
test (macos-14, amd64, 20)	18s
test (macos-12, arm64, 20)	15s
test (windows-latest, amd64, 20)	42s
test (ubuntu-latest, amd64, false, false, 20)	38s
test (ubuntu-latest, arm64, false, true, 20)	4m 54s
test (ubuntu-latest, arm64, true, true, 20)	4m 59s
test (ubuntu-latest, amd64, true, true, 20)	52s
	1h 2m 51s

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