Install hindsightcan with fetchcontent #339

	name: Check Formatting

	on: [pull_request]

	jobs:
	check-format:
	runs-on: ubuntu-20.04
	steps:
	- name: Checkout
	uses: actions/checkout@v1
	with:
	submodules: true
	- name: Install dependencies from APT
	run: \|
	sudo apt install -y git clang-format-11
	sudo update-alternatives --install /usr/bin/clang-format clang-format /usr/bin/clang-format-11 100 \
	--slave /usr/share/man/man1/clang-format.1.gz clang-format.1.gz /usr/share/man/man1/clang-format-11.1.gz
	- name: Check Formatting
	run: \|
	cd ${{ github.workspace }}
	git reset --soft $(git merge-base HEAD origin/master)
	diff=$(git clang-format-11 --diff)
	if [ $(echo "${diff}" \| wc -l) != 1 ]; then
	echo "Formatting errors detected! Suggested changes:" >&2
	echo "${diff}" >&2
	exit 1
	else
	echo "No formatting errors detected!"
	exit 0
	fi

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