Share built indexes across all test runs to speed up tests. #3034

Job	Run time
Build binary (Windows)	2m 29s
Run tests (1.80, false)	2m 44s
Check lint and rustfmt	21s
Build binary	39s
Run tests (1.81, false)	2m 46s
Semver: core-graphics	59s
Run tests (1.82, false)	2m 48s
Check if version changed	14s
Run tests (stable, false)	2m 40s
Run tests (beta, false)	2m 39s
Run tests (nightly, true)	2m 38s
Caching with feature config changed	32s
Semver: libp2p-gossipsub ~0.44.0 + libp2p-request-response ~0.24.0	1m 25s
Semver: libp2p-dcutr 1.62.0 and libp2p-relay 0.14.0	1m 17s
Caching across rustdoc versions	1m 30s
Semver: libp2p-uds 0.37.0	50s
Semver: libp2p-core 0.37.0	1m 8s
Check failure when installed rustc is too old	14s
Semver: bevy_core v0.9.0	37s
Semver: bevy_gltf v0.9.1	1m 4s
Semver: clap v3.2.0	52s
Semver: dependency has warnings with "-Dwarnings" (libp2p v0.53.1)	1m 9s
Semver: perf-event-open-sys2 v5.0.0	16s
Semver: ref-slice fork (git)	54s
Semver: ref-slice fork (sparse)	19s
Semver: sqllogictest v0.13.0	34s
Semver: tokio ~v1.25.0 (explicit)	3s
Semver: tokio ~v1.25.0 (implicit)	2s
Semver: ref-slice fork (Windows) (git)	1m 23s
Semver: ref-slice fork (Windows) (sparse)	51s
All CI stages	1s
Check for semver compliance	0s
Run the release workflow	0s
	35m 58s

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