CI

Extract shared CI setup into composite action & harden workflow #90

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Run time

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Job	Run time
Build on ubuntu-latest	8m 36s
Build on windows-latest	8m 8s
Build on macos-latest	7m 52s
Publish on windows-latest	5m 22s
Publish on macos-latest	18m 52s
Publish on ubuntu-latest	10m 23s
	59m 13s