Fix release

[DamianReeves]

…affects npm pack

NPM uses the npm-packlist package to create the package to create or publish a npm package. As of version 6.0.0 of npm-packlist root level ignore patterns in .gitignore are ignored when you use files in package.json (however nested are not ignored).

Issues were arising when publishing because cli2/.gitignore contained the lib folder which is actually needed in the deploy. Because we want to ignore cli2/lib from git because it is generated, but we DO want to include the folder in the package, we need to add cli2/lib/ to the root .gitignore file.

Also since it is not clear what version of Node folks are using, I've also added an .nvmrc file which is currently set to lts/hydrogen (version 18.x) which is an LTS version in Maintenance mode through June 2026.

Finally, updated the GitHub actions to also use 18.x

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