Working with gh-pages as an orphan branch

gh_pages.sh

# Create `gh-pages` branch from scratch

cd <dir>
git init
git remote add origin <url>
git checkout --orphan gh-pages

git add .
git commit -m "build 1.0.0"
git push origin gh-pages


# Clone remote `gh-pages` branch

git clone -b gh-pages --single-branch <url> <dir>


# Update `gh-pages` branch from existing folder

cd <dir>
git init
git remote add origin <url>
git fetch origin gh-pages
git reset origin/gh-pages
git checkout gh-pages

git add .
git commit -m "build 1.x.x"
git push origin gh-pages