Added `ruff format --check .` to CI and Makefile #47

Job	Run time
test-sqlite (3.10, Django>=4.1,<4.2)	9m 22s
test-postgres-elasticsearch7 (3.8, Django>=3.2,<3.3, false)	7m 33s
test-sqlite-elasticsearch8 (3.10, Django>=4.2,<4.3, emailuser)	5m 14s
test-mysql (3.9, Django>=3.2,<3.3, false)	18m 16s
test-sqlite-opensearch2 (3.9, Django>=4.1,<4.2, false)	6m 13s
test-mysql (3.11, Django>=4.2,<4.3, false, --parallel, mysql:8.1)	10m 1s
test-postgres (3.8, Django>=3.2,<3.3, false, --parallel)	12m 29s
test-postgres (3.11, Django>=4.1,<4.2, false, emailuser, --parallel)	6m 22s
test-postgres (3.12, Django>=4.2,<4.3, postgres:15, notz, false, --parallel)	8m 29s
test-postgres (3.10, git+https://github.com/django/django.git@stable/5.0.x#egg=Django, true)	25m 8s
test-postgres (3.10, git+https://github.com/django/django.git@main#egg=Django, true, postgres:lat...	8m 8s
coverage	1m 24s
	1h 58m 39s

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