ci: Add sccache compiler cache #2071

Job	Run time
build-test-server-windows	19m 7s
build-test-server	9m 43s
build-test-server-mac-curl	6m 27s
build-test-server-windows-curl	21m 24s
contract-tests-fdv2	5m 37s
contract-tests-fdv2-curl	5m 40s
contract-tests	5m 19s
build-test-server-curl	9m 50s
contract-tests-curl	5m 37s
build-test-server-mac	6m 26s
	1h 35m 10s

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