Add learn track for C #702

	name: "Format C code"

	on:
	issue_comment:
	types: [created]

	jobs:
	format:
	name: "Format C code"
	runs-on: ubuntu-20.04
	if: github.event.issue.pull_request != '' && contains(github.event.comment.body, '/format')
	steps:
	- name: 'Setup SSH deploy key'
	run: \|
	mkdir ~/.ssh
	echo "${{ secrets.DEPLOY_KEY }}" > ~/.ssh/id_ed25519
	chmod 600 ~/.ssh/id_ed25519

	- name: "Checkout code"
	run: \|
	PR_DATA="/tmp/pr.json"

	jq -r ".issue.pull_request.url" "$GITHUB_EVENT_PATH" \| \
	xargs curl --header 'authorization: Bearer ${{ secrets.GITHUB_TOKEN }}' -o "$PR_DATA" --url

	HEAD_REF=$(jq -r ".head.ref" "$PR_DATA")
	HEAD_REPO=$(jq -r '.head.repo.ssh_url' "$PR_DATA")

	git clone $HEAD_REPO .
	git checkout -b "$HEAD_REF" "origin/$HEAD_REF"

	- name: "Update"
	run: \|
	sudo apt-get -qq update

	- name: "Format C code"
	run: ./format.sh

	- name: "Commit formatted C code"
	run: \|
	# Check if there is nothing to commit (i.e. no formatting changes made)
	if [ -z "$(git status --porcelain)" ]; then
	echo "Code is already formatted correctly"
	exit 0
	fi

	# Set up the git user (required to commit anything)
	git config --global user.email "github-actions[bot]@users.noreply.github.com"
	git config --global user.name "github-actions[bot]"

	# Commit the changes made for code formatting
	git add .
	git commit -m "[CI] Format C code"
	git push

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