add legacy clone option

yaml/converter/legacy/internal/config.go

@@ -83,6 +83,13 @@ func Convert(d []byte, remote string) ([]byte, error) {
 				toContainer(container),
 			)
 		}
+	} else if os.Getenv("DRONE_CONVERT_YAML_LEGACY_CLONE") == "true" {
+		pipeline.Clone.Disable = true
+		pipeline.Steps = append(pipeline.Steps, &droneyaml.Container{
+			Name:  "clone",
+			Image: "plugins/git",
+			Pull:  "if-not-exists",
+		})
 	}
 
 	for _, container := range from.Services.Containers {