feat: add Tailwind CSS pipeline, tag-aware cloning & CI/CD #659

	name: CI

	on:
	push:
	branches: [ main ]
	pull_request:
	branches: [ main ]

	permissions:
	contents: read

	jobs:
	test:
	runs-on: ${{ matrix.os }}
	strategy:
	fail-fast: true
	matrix:
	os: [ubuntu-latest, macos-latest, windows-latest]
	python-version: ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]

	steps:
	- uses: actions/checkout@v4

	- name: Set up Python
	uses: actions/setup-python@v5
	with:
	python-version: ${{ matrix.python-version }}

	- name: Cache pip
	uses: actions/cache@v4
	with:
	path: ~/.cache/pip
	key: ${{ runner.os }}-pip-${{ hashFiles('pyproject.toml') }}
	restore-keys: \|
	${{ runner.os }}-pip-

	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	python -m pip install -e ".[dev]"

	- name: Run tests
	run: pytest

	# Run pre-commit only on Python 3.13 + ubuntu.
	- name: Run pre-commit hooks
	if: ${{ matrix.python-version == '3.13' && matrix.os == 'ubuntu-latest' }}
	run: pre-commit run --all-files

	frontend:
	needs: test # Builds Tailwind CSS only if tests pass
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4

	- name: Set up Node
	uses: actions/setup-node@v4
	with:
	node-version: 20
	cache: npm

	- name: Install Node deps
	run: npm ci

	- name: Build CSS
	run: npm run build:css # Creates src/static/css/site.css

	- name: Upload artefact
	uses: actions/upload-artifact@v4
	with:
	name: static-css
	path: src/static/css/site.css

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