Operator config option for default minSeverity

[erikgb]

As a cluster admin, I would like to set the default minimum severity when configuring the operator - as we would like to focus on vulnerabilities with severity HIGH and CRITICAL.

Is your feature request related to a problem? Please describe.

No

Describe the solution you'd like

The default minSeverity seems hardcoded to UNKNOWN:

image-scanner-operator/internal/controller/stas/scan_job_controller.go

Line 88 in e6132db

minSeverity := stasv1alpha1.SeverityUnknown

I think this should be configurable on the operator level - to avoid adding an annotation to all cluster workloads.

Describe alternatives you've considered

Put annotations on all cluster workloads, but that is not really an alternative - as we have hundreds of workloads.

Additional context