Add version selection

[lukerosser]

At the minute the checkov version is tied to the Github action version, and there's no correlation in the tags so if you want to pin a specific checkov version it's quite awkward.

It would be nice to change this to an input in the action, similar to how this tflint action works: https://github.com/marketplace/actions/setup-tflint#tflint_version

This allows more configurable functionality, and also allows the Github action features to progress without forcing a checkov version update at the same time.

[ivan-pinatti-ciandt]

+1 on this.

It helps to lock the version when running it locally through other tools like task or pre-commit and then match the version on the CI/CD pipeline (GHA).

[rusherr02]

Is it possible to integrate Checkov with GitHub CI?
I can't find any documentation for the same.
Can someone help?