refactor extensions flow #17

Job	Run time
plan	19s
build-local-artifacts (x86_64-pc-windows-msvc)	3m 56s
build-local-artifacts (x86_64-unknown-linux-gnu)	1m 30s
build-local-artifacts (aarch64-unknown-linux-gnu)	1m 22s
build-local-artifacts (x86_64-apple-darwin)	7m 18s
build-local-artifacts (aarch64-apple-darwin)	1m 29s
build-global-artifacts	19s
host	-1s
announce	0s
	16m 12s

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