With version 0.8.0 of ggcr a new package was added to enable the use of a keychain in k8s. We should explore the possibility of using this same keychain instead of the iaas keychain we currently have in our code.

This will allow us to remove the git patch that we are forcing on the library: github.com/vdemeester/k8s-pkg-credentialprovider

Example of usage: sigstore/cosign#1279