Do not throw on merging non-initialized flat histors #38

	name: Build Documentation

	on:
	push:
	branches:
	- 'dev'
	workflow_dispatch:
	jobs:
	build:
	runs-on: ubuntu-latest
	steps:
	- name: Install doxygen
	run: \|
	sudo apt-get update -y
	sudo apt-get install -y doxygen doxygen-doc doxygen-latex doxygen-gui graphviz cmake
	- uses: actions/checkout@v3
	with:
	ref: "dev"
	persist-credentials: false
	- name: Build docs
	run: \|
	cat > CMakeLists.txt <<\EOF
	add_subdirectory(doc)
	EOF
	cmake .
	make doc 2>&1 >log.txt
	git add doc/html
	git config --global user.email "[email protected]"
	git config --global user.name "GitHub Action Bot"
	git commit -m "Updated README" -a \|\| echo "No changes to commit"
	git push https://alibuild:${{ secrets.ALIBUILD_GITHUB_TOKEN }}@github.com/AliceO2Group/docs `git subtree split --prefix doc/html dev`:refs/heads/main --force

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