Support for configuring imagePullSecret in Kubero UI for private registry images

[fabriceclementz]

First, thank you for this awesome project! I've successfully set up Kubero in my Kubernetes cluster, but I encountered an issue when trying to deploy custom images from a private registry.

It seems the imagePullSecret is not automatically set in the deployment resource created by the operator via the UI. However, when manually applying a KuberoApp, I can specify imagePullSecrets as defined in the application.kubero.dev/v1alpha1 manifest.

Is there currently a way to configure imagePullSecret via the Kubero UI, or is this something that might be added in the future?

Thanks in advance for your help!