Include Helm for checkov scans

[andrewkreuzer]

Proposed changes

Includes Helm for the running of checkov scans with the helm framework

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In order to have this pull request merged, complete the following tasks.

Pull request author tasks

• I included all the needed documentation for this change.
• I provided the necessary tests.
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[ferrarimarco]

Hi @andrewkreuzer ! Thanks for this PR.

What problem are we solving here? :)

[andrewkreuzer]

when running checkov using the "helm" framework I wasn't seeing scans being done for my helm charts. Running locally I was able to get the desired output:

helm scan results:
   Passed checks: 233, Failed checks: 0, Skipped checks: 0

but wasn't seeing this output with superlinter

Running checkov in the superlinter container checkov --framework helm --var-file my-values.yaml --directory charts I was able to get to this error:

2024-05-09 14:17:51,287 [MainThread  ] [ERROR]  There are no runners to run. This can happen if you specify a file type and a framework that are not compatible (e.g., `--file xyz.yaml --framework terraform`), or if you specify a framework with missing dependencies (e.g., helm or kustomize, which require those tools to be on your system). Running with LOG_LEVEL=DEBUG may provide more information.

[ferrarimarco]

I see, thanks for the details!

[ferrarimarco]

Thanks for this PR!

Besides this, we would need some test cases (good and bad ones) in this dir: https://github.com/super-linter/super-linter/tree/main/test/linters/checkov

[ferrarimarco]

One minor change: can you please make the test helm charts smaller? We don't need to have a fully working chart as a test case. What we need is the bare minimum to have tests pass :)

Thanks!