Check for NODE_AUTH_TOKEN overwritten

[zodman]

the updated version of #83

If i set the NODE_AUTH_TOKEN and then execute the àctions/setup-node the NODE_AUTH_TOKEN was overwriten with XXXXX and lost my variable value.

What actually fix this:

 - run: echo "NODE_AUTH_TOKEN=${{secrets.PAT}}" >> $GITHUB_ENV
- name: Use Node.js 12.x
uses: actions/setup-node@v2.1.2
with:
node-version: 12.x
registry-url: https://npm.pkg.github.com/
scope: '@foo'
- run: echo "NODE_AUTH_TOKEN=${{secrets.PAT}}" >> $GITHUB_ENV

With the patch

 - run: echo "NODE_AUTH_TOKEN=${{secrets.PAT}}" >> $GITHUB_ENV
- name: Use Node.js 12.x
uses: actions/setup-node@v2.1.2
with:
node-version: 12.x
registry-url: https://npm.pkg.github.com/
scope: '@foo'

[nikita-bykov]

Hello @zodman! Thank you for your contribution! We apologize that the review takes too long.
Your changes generally look good for us. Please pull the latest changes from the main branch, rebuild dist file and after that we can merge the PR.

[zodman]

@maxim-lobanov pulled last changes ..

[maxim-lobanov]

@zodman thank you for contribution!