Choose randomly who to connect to and open slots with #4257

Job	Run time
check-features	3m 14s
test-32bits	8m 58s
test-64bits	11m 13s
wasm-node-check	2m 4s
cargo-deny (bans licenses sources)	28s
cargo-spellcheck	22s
check-no-std	1m 36s
check-rustdoc-links	52s
clippy	39s
fmt	33s
fuzzing-binaries-compile	4m 48s
wasm-node-versions-match	28s
all-ci	1s
	35m 16s

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