Add image push command (#656)

stack_orchestrator/constants.py

@@ -18,5 +18,7 @@ compose_deploy_type = "compose"
 k8s_kind_deploy_type = "k8s-kind"
 k8s_deploy_type = "k8s"
 kube_config_key = "kube-config"
+deploy_to_key = "deploy-to"
+image_resigtry_key = "image-registry"
 kind_config_filename = "kind-config.yml"
 kube_config_filename = "kubeconfig.yml"