Docs(CI/CD) - Add link to GitHub Actions Linter

[MitchV85]

In the CI/CD workshop, add an admonition with a link to the following GitHub Actions linter: https://rhysd.github.io/actionlint/

[JulioPDX]

Ill have to check but I think the ATD extensions included will notify users if the github actions file is not following the schema for actions