fix synosis #21

	name: deploy
	on:
	push:
	branches:
	- main
	jobs:
	deploy:
	runs-on: ubuntu-latest
	container:
	image: nixos/nix:latest
	steps:
	- name: deploy
	run: \|
	set -x

	git clone https://github.com/${{ github.repository }}.git
	cd $(basename ${{ github.repository }})

	echo "github.event_name is ${{ github.event_name }}"

	# fetch the current PR/branch
	if [ "${{ github.event_name }}" = "pull_request" ]; then
	echo "Fetching PR branch"
	git fetch origin pull/${{ github.event.pull_request.number }}/head:pr-${{ github.event.pull_request.number }}
	git checkout pr-${{ github.event.pull_request.number }}
	else
	echo "Fetching current branch"
	git checkout ${{ github.ref_name }}
	fi

	nix-shell --run "
	dune build @doc &&
	mv _build/default/_doc/_html doc
	"
	touch doc/.nojekyll

	git config --global user.name "github-actions[bot]"
	git config --global user.email "github-actions[bot]@users.noreply.github.com"

	git clone https://x-access-token:${{ secrets.GITHUB_TOKEN }}@github.com/${{ github.repository }} gh-pages
	cd gh-pages
	git checkout gh-pages \|\| git checkout --orphan gh-pages

	rm -rf ./*
	cp -r ../doc/* ./

	git add .
	git commit -m "Deploy docs from ${GITHUB_SHA}" \|\| echo "No changes to commit"
	git push origin gh-pages

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