Support secret key in AppTemplateValuesSourceRef

[jessehu]

Describe the problem/challenge you have We want to use a shared Secret across Package CRs, and use different keys in the Secret for different Package CRs.

Describe the solution you'd like Add 'key' field in AppTemplateValuesSourceRef just like AppClusterKubeconfigSecretRef https://github.com/vmware-tanzu/carvel-kapp-controller/blob/7d7ea1d65be1034906aca0145b895627ed4e233c/pkg/apis/kappctrl/v1alpha1/types.go#L92-L99

Anything else you would like to add: [Additional information that will assist in solving the issue.]

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[joe-kimmel-vmw]

Thanks @jessehu - independent of future development in kapp-controller, we think you could potentially solve this problem with existing tools today by using the "secrets template" feature in secretgen controller to re-shape the original secret for each app (though that solution will add a few extra steps).

It sounds like we'll work on this eventually but I guess you and others are free to argue it to bump it in priority and/or try your hand(s) at contributing this feature.

[jessehu]

Thanks Joe. This feature request is not high priority for us. We have a work around. I will see if we can make the contribution.