💚 Include checkouting submodule in code coverage CI #80

Job	Run time
test_mysql	1m 57s
build_and_test (ubuntu-latest)	2m 58s
lint	1m 5s
test_postgresql	1m 41s
build_and_test (windows-latest)	5m 31s
build_and_test (macos-latest)	4m 38s
	17m 50s

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