Add rego rule to check for windows securityContext compliance

[alegrey91]

In order to support Windows system, we should add rego rules to check for securityContext parameters also for this OS.
Reading from the official documentation, we should implement a control for each of the following listed fields: https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.26/#windowssecuritycontextoptions-v1-core
So, the new checks to be added, are the following:

• gmsaCredentialSpec
• gmsaCredentialSpecName
• hostProcess
• runAsUserName

The equivalent rules should be named like so:

• set-gmsacredentialspec-value
• set-gmsacredentialspecname-value
• set-hostprocess-true (checking also if WindowsHostProcessContainers feature flag is enabled in api-server)
• runAsUserName

[alegrey91]

@0xquark can this issue be of your interest?

[0xquark]

Yes! Seems like a good addition