Add automatic npm publishing to release workflow #3

Job	Run time
build (ubuntu-latest, darwin, arm64, ue-cli-darwin-arm64)	18s
build (ubuntu-latest, linux, amd64, ue-cli-linux-amd64)	16s
build (ubuntu-latest, linux, arm64, ue-cli-linux-arm64)	17s
build (ubuntu-latest, windows, amd64, .exe, ue-cli-windows-amd64)	16s
build (ubuntu-latest, darwin, amd64, ue-cli-darwin-amd64)	19s
release	20s
publish-npm	5s
	1m 51s

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