一つのRepositoryで複数のremote repositoryを管理する

mkdir project-folder

git remote add origin https://github.com/user/first-repo.git

git remote add second-remote https://github.com/user/second-repo.git

git remote -v

origin  https://github.com/user/first-repo.git (fetch)
origin  https://github.com/user/first-repo.git (push)
second-remote  https://github.com/user/second-repo.git (fetch)
second-remote  https://github.com/user/second-repo.git (push)

git checkout second-remote/main

git add .
git commit -m "commit message"
git push second-remote main

git push origin main
git push second-remote main

git pull origin main
git pull second-remote main

git remote remove origin
git remote remove second-remote