Integrate actionlint

[rollingmoai]

Is your feature request related to a problem? Please describe.
It would be nice to integrate actionlint to make use some of its features in this extension.

Describe the solution you'd like
Integrate actionlint in this extension.

Additional context
https://github.com/rhysd/actionlint

[elbrenn]

Thanks for the request. We aren't planning to integrate any command line linting here, but if there are specific validation features you'd like to see in the vscode editor, we'd love to hear about them 🙂