Test

CC-1256: Add gleam support to grep challenge #260

Job	Run time
test_course_definition / docker_lint	8s
test_course_definition / identify_language_slugs	13s
test_course_definition / go_lint	6s
test_course_definition / js_lint	25s
test_course_definition / markdown_lint	25s
test_course_definition / rust_lint	5s
test_course_definition / validate-schemas	20s
test_course_definition / validate-stages-naming	4s
test_course_definition / verify_templates_compiled	27s
test_course_definition / test (cpp)	41s
test_course_definition / test (csharp)	1m 4s
test_course_definition / test (gleam)	37s
test_course_definition / test (go)	48s
test_course_definition / test (haskell)	1m 59s
test_course_definition / test (javascript)	23s
test_course_definition / test (python)	38s
test_course_definition / test (ruby)	26s
test_course_definition / test (rust)	45s
test_course_definition / test (typescript)	50s
	10m 24s

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