Improve OIDC provider JWT retrieval documentation

[NeoCat]

Code of Conduct

• I have read and agree to the GitHub Docs project's Code of Conduct

What article on docs.github.com is affected?

Requesting the JWT using environment variables

What part(s) of the article would you like to see updated?

The current documentation for manually requesting a JSON Web Token (JWT) from the GitHub OIDC provider has several issues:

1. The name of environment variable in the script is not valid ( ACTIONS_RUNTIME_TOKEN must be ACTIONS_ID_TOKEN_REQUEST_TOKEN )
2. The whole node script step is redundant.
3. jq availability is checked after it is actually used.
4. Printing tokens / signature to logs has potential security risks and is not useful.

Additional information

No response

[welcome]

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[nguyenalex836]

@NeoCat Thank you for opening an issue and linking it to your PR! ✨

[nguyenalex836]

Closing per comment here 💛