Pass the default github token to the github-token input

[smorimoto]

As the title says...

Checklist

• run npm run test and npm run benchmark
• tests and/or benchmarks are included
• documentation is changed or added
• commit message and code follows the Developer's Certification of Origin
  and the Code of conduct

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[simoneb]

Are you sure that this works? I can't find anything in the docs suggesting that you can specify dynamic default values for action inputs. Do you have a sample repo showing that this works?

[climba03003]

I see similar approach on actions/checkout.

https://github.com/actions/checkout/blob/main/action.yml#L12-L24

[simoneb]

Ah that's pretty cool, too bad this is not in the docs!

@smorimoto can you please update the docs to reflect this?