Config by file or environment variable

https://github.com/github/super-linter uses kubeval but it does not support passing flags. Only config files or environment variables are used to configure individual check behavior. If kubeval supports either, then I can use super-linter for my openshift resources.

The issue names no files or tests. First inspect how kubeval currently handles command-line flags and how its checks are configured. Determine whether configuration through files or environment variables is feasible, then verify that super-linter can configure individual checks without flags.

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