feat: define recipe version inside app env file

cli/app/rollback.go

@@ -86,6 +86,9 @@ EXAMPLE:
 		}
 
 		specificVersion := c.Args().Get(1)
+		if specificVersion == "" {
+			specificVersion = app.Recipe.Version
+		}
 		if specificVersion != "" {
 			parsedDeployedVersion, err := tagcmp.Parse(deployMeta.Version)
 			if err != nil {