Add FLOW_REGISTRY_URL to shell config during install #15

Job	Run time
build (aarch64-apple-darwin, macos-latest)	3m 41s
build (x86_64-apple-darwin, macos-latest)	3m 20s
build (x86_64-unknown-linux-gnu, ubuntu-latest)	3m 25s
build (aarch64-unknown-linux-gnu, ubuntu-latest)	3m 39s
release	1s
	14m 6s

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