BucketList cache #6402

Job	Run time
rust-check-git-rev-deps	27s
fmt	33s
build (gcc, current)	2m 5s
cargo-deny (advisories)	1m 18s
build (gcc, current, --check-test-tx-meta)	1m 56s
cargo-deny (bans licenses sources)	46s
build (gcc, next)	2m 27s
build (gcc, next, --check-test-tx-meta)	1m 57s
build (clang, current)	1m 59s
build (clang, current, --check-test-tx-meta)	1m 58s
build (clang, next)	2m 12s
build (clang, next, --check-test-tx-meta)	1m 57s
complete	1s
	19m 36s

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