CC-1333 Add repository aware caching #247

Job	Run time
test_course_definition / go_lint	10s
test_course_definition / docker_lint	6s
test_course_definition / identify_language_slugs	3s
test_course_definition / js_lint	24s
test_course_definition / lint	50s
test_course_definition / markdown_lint	23s
test_course_definition / rust_lint	6s
test_course_definition / validate-schemas	21s
test_course_definition / validate-stages-naming	10s
test_course_definition / verify_templates_compiled	22s
test_course_definition / test (cpp)	21s
test_course_definition / test (csharp)	20s
test_course_definition / test (gleam)	54s
test_course_definition / test (go)	21s
test_course_definition / test (java)	27s
test_course_definition / test (javascript)	27s
test_course_definition / test (python)	28s
test_course_definition / test (ruby)	27s
test_course_definition / test (rust)	20s
test_course_definition / test (swift)	58s
test_course_definition / test (typescript)	20s
test_course_definition / test (zig)	1m 12s
	9m 30s

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