Why I can’t find information how to use config maps in GKE?
https://kubernetes.io/docs/concepts/configuration/configmap/
https://kubernetes.io/docs/tasks/configure-pod-container/configure-pod-configmap/
As best I know, there shouldn’t be anything specific to GKE as far as configmaps, so any general documentation about configmaps that you can find should apply
If you’re trying to do something specific, for example, binding kube secrets to GCP secret manager secrets, that may be a little more GKE-specific