attempt proper caching of docker base #420

Job	Run time
Build (docker-linux-arm64)	23m 55s
Build (docker-linux-x64)	29m 58s
Build (macos-x64)	29m 47s
Pin Check / Pin Check	14s
Build (linux-arm64)	16m 29s
Build (macos-arm64)	23m 22s
Build (windows-x64)	37m 54s
Build (linux-x64)	19m 11s
License Check / License Check	4s
Build (cpp-example-collection-linux-arm64)	4m 30s
Build (cpp-example-collection-x64)	4m 25s
	3h 9m 49s

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