packaging: allow local js gem installs in nightly npm builds #747

Job	Run time
ci-data	4s
Push source gem	-1s
Compile native gem for aarch64-linux	6m 3s
Compile native gem for arm64-darwin	5m 48s
Compile native gem for aarch64-linux-musl	5m 46s
Compile native gem for x86_64-linux	9m 15s
Compile native gem for x86_64-darwin	5m 35s
Compile native gem for x64-mingw-ucrt	5m 44s
Compile native gem for x86_64-linux-musl	5m 39s
	43m 53s

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