Add method to skip wrong reference format

[paretl]

Observation
When an image reference format is wrong, the mutating webhook is failing and the deployment cannot go further. Even if the regex does not include this image.

I think that it should be great to skip that case and let the mutating webhook deploies this deployment anyway.

I detected that in a case where ArgoCD + Image updater need to deploy a pod without tag before finding / applying a new tag. So without this the ArgoCD deployments could be broken

Solution

Add a method to verify the reference format, if it's wrong, just skip the mutating webhook changes and return the same imageRef

Tests

• unit test for this case is done
• I have tested it in a real environment and it works as expected