* update tests to latest `versions.json`
* allow specifying the version as `lts` to install the latest LTS version
for now, this just hardcodes the LTS version in the source (similar to how juliaup does it) since the latest LTS is not available in `versions.json`. Since the LTS is updated so rarely this might be ok for now.
* add a 'pre' version
* Run `npm ci` followed by `npm run build`
* Add a CI job to test `pre`
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Co-authored-by: Viral B. Shah <ViralBShah@users.noreply.github.com>
Co-authored-by: Dilum Aluthge <dilum@aluthge.com>
