fix: error handling in deploy

cli/app/deploy.go

@@ -61,11 +61,15 @@ upgrade <app>" command. You may pass "--force" to re-deploy the same version.
 			if len(versions) > 0 {
 				version = versions[len(versions)-1]
 				logrus.Infof("choosing '%s' as version to deploy", version)
-				recipe.EnsureVersion(app.Type, version)
+				if err := recipe.EnsureVersion(app.Type, version); err != nil {
+					logrus.Fatal(err)
+				}
 			} else {
 				version = "latest commit"
 				logrus.Warning("no versions detected, using latest commit")
-				recipe.EnsureLatest(app.Type)
+				if err := recipe.EnsureLatest(app.Type); err != nil {
+					logrus.Fatal(err)
+				}
 			}
 		}