packaging: allow local js gem installs in nightly npm builds #746

Job	Run time
ci-data	5s
Push source gem	0s
Compile native gem for x86_64-linux-musl	5m 30s
Compile native gem for aarch64-linux	5m 32s
Compile native gem for x86_64-linux	8m 35s
Compile native gem for x86_64-darwin	5m 34s
Compile native gem for aarch64-linux-musl	5m 51s
Compile native gem for arm64-darwin	5m 45s
Compile native gem for x64-mingw-ucrt	5m 17s
	42m 9s

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