Add input for NodeJS distribution url

[petercort]

Description:
Add an input named distribution-url which would set the URL where the specified nodejs dist is downloaded from.

Justification:

1. Periodically using the default NodeJS download url fails causing jobs to fail and it would be nice to point to a custom mirror.
2. Security and network isolation concerns related to private packages apply to the node dist itself as well.

Are you willing to submit a PR?
Yes!

[priyagupta108]

Hi @petercort 👋 ,
Thank you for the feature request, We'll investigate it and get back to you with updates.

[decyjphr]

@priyagupta108 Any update on this.

Also for documentation purposes, here is the ask in customer's words (Peter has already distilled this accurately above):

• We've been having a noticeable issue with nodejs.org timing out while trying to download a particular distribution of node. We've historically experienced a similar issue on our legacy (bamboo & jenkins) pipelines - So it's fairly apparently it's not actually an actions issue.
  We solved it in legacy by mirroring the nodejs repository in our internal Artifactory instance. We'd like to do this in actions as well, however the actions/setup-node code has nodejs.org hardcoded as the download url: https://github.com/actions/setup-node/blob/main/src/distributions/official_builds/official_builds.ts#L179-L181
  We were considering opening a pull request against the action to allow something along the lines of an NODEJS_REPOSITORY_URL override variable to allow a custom mirror. It would also need to be able to present credentials to that registry.

[enyil]

I believe the easiest way would be to merge this PR: #134