Build image name is mismatched.

[Jindolph]

I'm here by following Spring Guide.
First, thanks for your efforts.

I don't know if it's right to say here.

Anyway, at the command line, building docker image, You used below, which means image name should be "spring-k8s/hello-spring-k8s".
./mvnw spring-boot:build-image -Dspring-boot.build-image.imageName=spring-k8s/hello-spring-k8s

and then, you use "spring-k8s/gs-spring-boot-k8s:snapshot" image on the kubectl command.
kubectl create deployment gs-spring-boot-k8s --image spring-k8s/gs-spring-boot-k8s:snapshot -o yaml --dry-run=client > deployment.yaml

One more thing to say, In my case, it didn't work with imagePullPolicy setting.
imagePullPolicy: Never
I solved it by loading image on minikube,
minikube image load $image_name