packaging: allow local js gem installs in nightly npm builds #744

Job	Run time
ci-data	5s
Push source gem	-1s
Compile native gem for aarch64-linux-musl	23s
Compile native gem for arm64-darwin	24s
Compile native gem for aarch64-linux	24s
Compile native gem for x86_64-linux	30s
Compile native gem for x86_64-darwin	29s
Compile native gem for x64-mingw-ucrt	27s
Compile native gem for x86_64-linux-musl	25s
	3m 6s

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