publish.sh

#!/bin/sh
# shellcheck disable=all
set -e

INPUT_BRANCH=${INPUT_BRANCH:-gh-pages}
INPUT_DIRECTORY=${INPUT_DIRECTORY:-'website/build'}
OUTPUT_DIRECTORY=${OUTPUT_DIRECTORY:-'gh-pages'}

[ -z "${GITHUB_TOKEN}" ] && {
    echo 'Missing input "GITHUB_TOKEN=${{ secrets.GITHUB_TOKEN }}".'
    exit 1
}

remote_repo="https://${GITHUB_ACTOR}:${GITHUB_TOKEN}@github.com/${GITHUB_REPOSITORY}.git"

rm -rf "${OUTPUT_DIRECTORY}"
git clone --branch "${INPUT_BRANCH}" "${remote_repo}" "${OUTPUT_DIRECTORY}"
mv "${OUTPUT_DIRECTORY}/.git" output.git
rm -rf "${OUTPUT_DIRECTORY}"
cp -r "${INPUT_DIRECTORY}" "${OUTPUT_DIRECTORY}"

mv output.git "${OUTPUT_DIRECTORY}/.git"
cd "${OUTPUT_DIRECTORY}"
touch .nojekyll

git config --local user.email "action@github.com"
git config --local user.name "GitHub Action"
git add .

if [ "$(git status --porcelain=v1 2>/dev/null | wc -l)" != "0" ]; then
    git commit -m "Documentation autoupdate"

    echo "Push to branch $INPUT_BRANCH"
    git push "${remote_repo}" HEAD:${INPUT_BRANCH} --follow-tags
else
    echo "Branch ${INPUT_BRANCH} already up-to-date"
fi