ci: Add sccache compiler cache #3047

Job	Run time
build-test-curl	6m 47s
contract-tests-curl	3m 56s
contract-tests	3m 27s
build-test-client-windows-curl	5m 42s
build-test-client-mac	3m 56s
build-test-client-mac-curl	3m 29s
build-test-client-windows	5m 59s
build-test	6m 41s
	39m 57s

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