Workflows should not generally run on forks or should fail gracefully

[jsoref]

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?

The ability to contribute changes

What changes are you suggesting?

github.com/github/docs/.github/workflows/*.yml should not generally run on forks or should fail gracefully

Additional information

https://github.com/jsoref/github-docs/runs/3378739101?check_suite_focus=true

Add requests to board
failed 13 hours ago in 1m 8s
Run node .github/actions-scripts/fr-add-docs-reviewers-requests.js
#ERROR# HttpError: Bad credentials
Error: Process completed with exit code 1.

[L2021]

Really it is amazing

[Alkarar1122]

Vary happy

[heiskr]

I've created an internal issue to review.