Support node.js mirror like nvm

[thomas-z-meyer-db]

Description:
Support alternate nodejs download mirror like nvm

nvm does support setting a mirror via environment variable, e.g:
NVM_NODEJS_ORG_MIRROR=https://artifactory.company.com/artifactory/node-dist/

setup-node should also support a similar option "mirror" to specify an alternate node.js base URL for downloading the node.js binaries.

Justification:
All node.js binaries are downloaded directly from the internet via a specified proxy in the github action runners environment, which created egress costs for self-hosted github action runners in GHEC.

By using mirror option the reliance on node.js site is decoupled and egress is saved.

Are you willing to submit a PR?
i think i'm not allowed...

[MaksimZhukov]

Hello @thomas-z-meyer-db ! Thank you for the suggested idea!
We will consider adding this feature and will let you know as soon as we have any decision.

[Santas]

nodejs.org seems to fail quite often in the recent weeks. Having a possibility to specify a mirror would be great.

[bgalek]

Hi! I'm also affected by nodejs.org fails.
Is setup-node action caching the node tarball, so it's not downloaded every time?
https://github.com/actions/toolkit/tree/main/packages/tool-cache

[dariusz22p]

NodeJs has been timing out a lot in recent days for us, so this feature would make our life much easier

[yeikel]

Is this feature open for OSS contributions?

[zhyc9de]

#134 can resolve this problom, can we merge it ?