packaging: allow local js gem installs in nightly npm builds #745

Job	Run time
ci-data	6s
Push source gem	0s
Compile native gem for aarch64-linux-musl	1m 29s
Compile native gem for aarch64-linux	1m 20s
Compile native gem for x86_64-linux	1m 27s
Compile native gem for x86_64-linux-musl	1m 34s
Compile native gem for arm64-darwin	1m 39s
Compile native gem for x86_64-darwin	1m 38s
Compile native gem for x64-mingw-ucrt	1m 32s
	10m 45s

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