Don't use JSON.stringify for errors (#19)

* better error handling

* remove unneeded catch

* Update index.ts

packages/k8s/src/index.ts

@@ -22,7 +22,7 @@ async function run(): Promise<void> {
       throw new Error(
         `The Service account needs the following permissions ${JSON.stringify(
           requiredPermissions
-        )} on the pod resource in the '${namespace}' namespace. Please contact your self hosted runner administrator.`
+        )} on the pod resource in the '${namespace()}' namespace. Please contact your self hosted runner administrator.`
       )
     }
     switch (command) {