Reusable module cache #6662

Job	Run time
fmt	22s
rust-check-git-rev-deps	18s
cargo-deny (advisories)	43s
build (gcc, current)	1h 13m 49s
cargo-deny (bans licenses sources)	43s
build (gcc, current, --check-test-tx-meta)	1h 1m 52s
build (gcc, next)	1h 14m 18s
build (gcc, next, --check-test-tx-meta)	59m 10s
build (clang, current)	58m 17s
build (clang, current, --check-test-tx-meta)	52m 41s
build (clang, next)	1h 1m 56s
build (clang, next, --check-test-tx-meta)	56m 11s
complete	1s
	8h 20m 21s

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