fix: Use GH_TOKEN token for protected branch

[nschonni]

Allow continuing to use GitHub Secret as token for protected branch.

[nschonni]

@mcking65 or @michael-n-cooper with this, the GitHub actions push should still work to the protected branches here if you set a GH_TOKEN GitHub secret for this repo https://docs.github.com/en/actions/configuring-and-managing-workflows/creating-and-storing-encrypted-secrets

For the forks, it falls back to the regular built-in token if they haven't set the variable, or protected the gh-pages branch.

[mcking65]

I will need @michael-n-cooper to create the secret with the token; it requires a repo owner.

[michael-n-cooper]

I've created the GH_TOKEN secret.

[nschonni]

Thanks @michael-n-cooper!
If you land this one @mcking65 we should be able to see if it's up and running again

[nschonni]

@michael-n-cooper sorry, I think the token might be wrong.

Can you try doing this to update the GH_TOKEN value:

1. Go to https://github.com/settings/tokens/new
2. Select public_repo as the only scope
3. Update https://github.com/w3c/aria-practices/settings/secrets/GH_TOKEN
4. Try to re-run the current failed job https://github.com/w3c/aria-practices/actions/runs/225990346

[michael-n-cooper]

Sorry, I misunderstood what should be the secret. I gave it a random value. I updated it to be the value of the GH_TOKEN for the repository, and it appeared the job succeeded.

[nschonni]

Awesome, thanks for the patience @michael-n-cooper, and sorry for the missing instructions at the start

[mcking65]

Thank you @nschonni and @michael-n-cooper!!