docs: add a section to HACKING.md on PR titles (commit messages to main) #1521

	name: Data Charm Tests

	on: [push, pull_request, workflow_call]

	jobs:
	db-charm-tests:
	runs-on: ubuntu-latest
	strategy:
	fail-fast: false
	matrix:
	include:
	- charm-repo: canonical/postgresql-operator
	commit: 4feeaeee102cbf5e3dada3c05d44e0495ca68f9a # rev409 2024-05-21T12:52:24Z
	- charm-repo: canonical/postgresql-k8s-operator
	commit: 1a25c3929747beea7e78467b169b2b345b29d470 # 2024-05-21T12:40:19Z
	- charm-repo: canonical/mysql-operator
	commit: 19633f3e904d1c3296477b3df191d1ca265fc0d5 # rev234 2024-05-06T12:13:54Z
	- charm-repo: canonical/mysql-k8s-operator
	commit: 6c09910bc3bd88eb632793d08fa17340c6903cb2 # rev138 2024-05-01T18:08:13Z
	steps:
	- name: Checkout the ${{ matrix.charm-repo }} repository
	uses: actions/checkout@v4
	with:
	repository: ${{ matrix.charm-repo }}
	ref: ${{ matrix.commit }}

	- name: Checkout the operator repository
	uses: actions/checkout@v4
	with:
	path: myops

	- name: Install patch dependencies
	run: pip install poetry~=1.6

	- name: Update 'ops' dependency in test charm to latest
	run: \|
	if [ -e "requirements.txt" ]; then
	sed -i -e "/^ops[ ><=]/d" -e "/canonical\/operator/d" -e "/#egg=ops/d" requirements.txt
	echo -e "\ngit+$GITHUB_SERVER_URL/$GITHUB_REPOSITORY@$GITHUB_SHA#egg=ops" >> requirements.txt
	else
	sed -i -e "s/^ops[ ><=].*/ops = {path = \"myops\"}/" pyproject.toml
	poetry lock
	fi

	- name: Install dependencies
	run: pip install tox~=4.2

	- name: Run the charm's unit tests
	run: tox -vve unit

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