Optimised CI (#182) #16

Job	Run time
build-node (ubuntu-latest, x86_64-unknown-linux-gnu, polkadot-bulletin-chain-linux)	33m 9s
build-runtimes (bulletin-westend, bulletin-westend-runtime, runtimes/bulletin-westend)	22m 8s
build-node (macos-14, aarch64-apple-darwin, polkadot-bulletin-chain-macos-aarch64)	39m 38s
build-runtimes (bulletin-polkadot, bulletin-polkadot-runtime, runtimes/bulletin-polkadot)	14m 11s
publish-release	9s
	1h 49m 15s

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