Reusable module cache #6666

Job	Run time
fmt	24s
cargo-deny (advisories)	39s
build (gcc, current)	1h 26m 5s
rust-check-git-rev-deps	15s
cargo-deny (bans licenses sources)	40s
build (gcc, current, --check-test-tx-meta)	57m 49s
build (gcc, next)	1h 18m 8s
build (gcc, next, --check-test-tx-meta)	1h 11m 12s
build (clang, current)	59m 35s
build (clang, current, --check-test-tx-meta)	52m 44s
build (clang, next)	1h 2m 54s
build (clang, next, --check-test-tx-meta)	46m 9s
complete	1s
	8h 36m 35s

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