feat: add support for checkov

[fleroux514]

Adding setup-checkov and checkov-version Github Action input parameters to setup checkov

Example config in digger.yml

projects:
  - name: project_a_d
    dir: ./project_a/development
    workflow: project_a

workflows:
  project_a:
    plan:
      steps:
        - init
        - plan
        - run: checkov -d . --framework terraform

See https://github.com/diggerhq/francios-tests/actions/runs/4999052252/jobs/8955062270

[Spartakovic]

Adding setup-checkov and checkov-version Github Action input parameters to setup checkov

The binary gets installed under ./python_venv/bin/checkov and can be executed as this in digger.yml

projects:
  - name: project_a_d
    dir: ./project_a/development
    workflow: project_a

workflows:
  project_a:
    plan:
      steps:
        - init
        - plan
        - run: ../../python_venv/bin/checkov -d . --framework terraform

See https://github.com/diggerhq/francios-tests/actions/runs/4999052252/jobs/8955062270

Updated the PR, to avoid having to do "../../python_venv/bin/checkov". It should work with just "checkov"

[UtpalJayNadiger]

@fleroux514 please meet @JamesWoolfenden from the Bridgecrew team (creators and maintainers of Checkov). He had a question and I thought you would be best placed to answer:

looks good for setting up, how would you run and you supply params?

[fleroux514]

@JamesWoolfenden

It can run by configuring the digger.yaml file, as the example I included in this PR description.

The command would be hardcoded per project