Support old restart policy in compose v3

pkg/loader/compose/v3.go

@@ -285,10 +285,16 @@ func dockerComposeToKomposeMapping(composeObject *types.Config) (kobject.Kompose
 
 		}
 
-		// restart-policy:
+		// restart-policy: deploy.restart_policy.condition will rewrite restart option
+		// see: https://docs.docker.com/compose/compose-file/#restart_policy
+		serviceConfig.Restart = composeServiceConfig.Restart
 		if composeServiceConfig.Deploy.RestartPolicy != nil {
 			serviceConfig.Restart = composeServiceConfig.Deploy.RestartPolicy.Condition
 		}
+		if serviceConfig.Restart == "unless-stopped" {
+			log.Warnf("Restart policy 'unless-stopped' in service %s is not supported, convert it to 'always'", name)
+			serviceConfig.Restart = "always"
+		}
 
 		// replicas:
 		if composeServiceConfig.Deploy.Replicas != nil {