fix: update to add the fork remote (#2010)

Author: jackton1

dist/index.js

@@ -747,7 +747,7 @@ export const getParentSha = async ({cwd}: {cwd: string}): Promise<string> => {
 export const setForkRemote = async ({cwd}: {cwd: string}): Promise<void> => {
   await exec.getExecOutput(
     'git',
-    ['remote', 'set-url', 'fork', github.context.payload.repository?.clone_url],
+    ['remote', 'add', 'fork', github.context.payload.repository?.clone_url],
     {
       cwd,
       silent: !core.isDebug()