Test

Add flate2 to Cargo.toml for #ic4 #509

Job	Run time
test_course_definition / go_lint	4s
test_course_definition / identify_language_slugs	2s
test_course_definition / docker_lint	6s
test_course_definition / js_lint	13s
test_course_definition / lint	51s
test_course_definition / markdown_lint	18s
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	21s
test_course_definition / test (c)	1m 14s
test_course_definition / test (cpp)	1m 17s
test_course_definition / test (csharp)	50s
test_course_definition / test (go)	46s
test_course_definition / test (haskell)	4m 10s
test_course_definition / test (java)	1m 6s
test_course_definition / test (javascript)	27s
test_course_definition / test (kotlin)	1m 44s
test_course_definition / test (python)	23s
test_course_definition / test (ruby)	34s
test_course_definition / test (rust)	45s
test_course_definition / test (typescript)	59s
test_course_definition / test (zig)	1m 26s
	18m 5s

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