Test

Implement writing a tree to the .git/objects directory. #321

Job	Run time
test_course_definition / js_lint	33s
test_course_definition / go_lint	3s
test_course_definition / markdown_lint	28s
test_course_definition / identify_language_slugs	5s
test_course_definition / rust_lint	6s
test_course_definition / validate-schemas	18s
test_course_definition / validate-stages-naming	5s
test_course_definition / verify_templates_compiled	28s
test_course_definition / test (cpp)	47s
test_course_definition / test (go)	40s
test_course_definition / test (haskell)	2m 17s
test_course_definition / test (java)	1m 6s
test_course_definition / test (javascript)	32s
test_course_definition / test (python)	23s
test_course_definition / test (ruby)	22s
test_course_definition / test (rust)	1m 47s
	10m 0s

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