Replace imghdr.what with PIL.Image.format (#126) #107

	name: Django Thumbnails

	on:
	push:
	branches: [ master ]
	pull_request:
	branches: [ master ]

	jobs:
	build:
	runs-on: ubuntu-latest
	services:
	redis:
	image: redis
	options: >-
	--health-cmd "redis-cli ping"
	--health-interval 10s
	--health-timeout 5s
	--health-retries 5
	ports:
	- 6379:6379
	strategy:
	matrix:
	python-version: [3.8.15, 3.9, 3.10.9]
	django-version: [2.1.3, 2.2.9, 3.0.11, 3.1.1, 4.0, 4.1.4]
	steps:
	- uses: actions/checkout@v2
	- name: Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v2
	with:
	python-version: ${{ matrix.python-version }}
	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	pip3 install Django==${{ matrix.django-version }} times da-vinci pillow redis shortuuid
	sudo apt-get install -qq optipng
	env:
	REDIS_HOST: localhost
	REDIS_PORT: 6379
	- name: Test check
	run: \|
	make test

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