fix(ppm): remove only the old diff.png of the image being examined #6

	# Based on https://github.com/CTeX-org/ctex-kit/blob/master/.github/workflows/test.yml

	name: Test suite

	on:
	pull_request:
	types:
	# added "ready_for_review"
	# https://docs.github.com/en/actions/using-workflows/events-that-trigger-workflows#pull_request
	[opened, ready_for_review, reopened, synchronize]
	push:
	schedule:
	# at 12:21 UTC (20:21 CST/UTC +8) on every Friday
	- cron: "21 12 * * 5"
	workflow_dispatch:

	jobs:
	tests:
	strategy:
	matrix:
	config: ["build", "config-old"]
	option: ["", "--dev"]
	name: "Tests: ${{ matrix.config }}${{ matrix.option != '' && ' (latex-dev)' \|\| '' }}"
	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v4
	- name: Setup TeX Live
	uses: teatimeguest/setup-texlive-action@v3
	with:
	package-file: .github/tl_package
	update-all-packages: true

	- name: Run tests
	run: \|
	l3build check \
	-c${{ matrix.config }} --halt-on-error --show-saves \
	${{ matrix.option }}

	# imagemagick is pre-installed on Ubuntu 22.04 image
	# https://github.com/actions/runner-images/blob/main/images/ubuntu/Ubuntu2204-Readme.md#installed-apt-packages
	- name: Install ppmcheckpdf dependencies
	if: matrix.config == 'config-old'
	run: \|
	sudo apt-get install imagemagick poppler-utils

	- name: Check tests with ppmcheckpdf
	if: matrix.config == 'config-old'
	run: \|
	texlua ppmcheckpdf.lua

	# TODO: generate a list of files related to failed tests, then
	# upload all them (.tex, .log, .pdf, .png, .md5, etc.)
	- name: Upload diff files
	if: failure()
	uses: actions/upload-artifact@v4
	with:
	name: tabularray-diffs
	path: \|
	build/*/.diff
	build/*/.diff.png

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