Fix the error when add git remote (#5)

* Fix the error when add git remote

* Always remove remote backup at the end

Author: LinuxSuRen

entrypoint.sh

@@ -18,3 +18,5 @@ git config --global user.name "${GITHUB_ACTOR}"
 git config --global user.email "${GITHUB_ACTOR}@users.noreply.github.com"
 echo 'ready to push'
 git push backup master -f
+git remote remove backup
+