explicit workerpoolApiUrlSchema accepts empty string

Author: PierreJeanjacquot

src/common/utils/validator.js

@@ -818,7 +818,7 @@ export const textRecordValueSchema = () => string().default('').strict(true);
 
 export const workerpoolApiUrlSchema = () =>
   string()
-    .matches(/^(|https?:\/\/.*)$/, '${path} "${value}" is not a valid URL')
+    .matches(/^(https?:\/\/.*)?$/, '${path} "${value}" is not a valid URL') // accept empty string to reset workerpool URL
     .default('');
 
 export const smsUrlOrMapSchema = () =>