add cache for installer (#19) #57

Job	Run time
latest on macos-latest (cache)	2m 47s
latest on macos-latest	54s
2.0.0 on macos-latest (cache)	1m 44s
2.0.0 on macos-latest	1m 42s
latest on ubuntu-latest (cache)	39s
latest on ubuntu-latest	1m 49s
2.0.0 on ubuntu-latest (cache)	1m 12s
2.0.0 on ubuntu-latest	36s
latest on windows-latest (cache)	5m 11s
latest on windows-latest	5m 30s
2.0.0 on windows-latest (cache)	2m 28s
2.0.0 on windows-latest	5m 30s
	30m 2s

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