[REF] Port `demo.py` to elisp #16

	name: CI

	on:
	push:
	paths-ignore: ['**.md']
	pull_request:
	paths-ignore: ['**.md']

	jobs:
	test:
	runs-on: ${{ matrix.os }}
	continue-on-error: ${{ matrix.emacs_version == 'snapshot' }}

	strategy:
	matrix:
	os:
	- ubuntu-latest
	emacs_version: [
	'27.1', '27.2',
	'28.1', '28.2',
	'29.1', '29.2', '29.3',
	'snapshot'
	]

	steps:
	- name: Set up Emacs
	uses: jcs090218/setup-emacs@master
	with:
	version: ${{ matrix.emacs_version }}

	- name: Install Eldev
	uses: emacs-eldev/setup-eldev@v1

	- name: Check out the source code
	uses: actions/checkout@v4
	with:
	fetch-depth: 0

	- name: Test the project
	env:
	COVERALLS_REPO_TOKEN: ${{ secrets.COVERALLS_REPO_TOKEN }}
	run: \|
	rm -r demo
	eldev \
	--debug \
	--packaged \
	--trace \
	--time \
	--color=always \
	test
	eldev \
	--debug \
	--trace \
	--time \
	--color=always \
	test -u on,coveralls

	- name: Ensure clean byte-compilation
	run: \|
	eldev \
	--debug \
	--trace \
	--time \
	--color=always \
	compile \
	--warnings-as-errors

	- name: Lint the project
	run: \|
	eldev \
	--debug \
	--trace \
	--time \
	--color=always \
	lint

	- name: Run all doctor tests
	run: \|
	eldev \
	--verbose \
	--debug \
	--packaged \
	--trace \
	--time \
	--color=always \
	--backtrace-on-abort \
	doctor --all-tests

Provide feedback