Is there a good way to pass an auth token for a npm install-tool custom-registry override?

[pachuka]

I followed https://github.com/containerbase/base/blob/main/docs/custom-registries.md for using our internal registry for npm tools, but our registry requires auth. Didn't see a good way to pass that through, so was wondering if there were any ideas around that.

Use case/context is in conjunction with the renovatebot github-action - https://github.com/renovatebot/github-action