Test

Remove README.md from .dockerignore #794

Job	Run time
test_course_definition / docker_lint	6s
test_course_definition / go_lint	4s
test_course_definition / identify_language_slugs	5s
test_course_definition / js_lint	24s
test_course_definition / lint	50s
test_course_definition / markdown_lint	24s
test_course_definition / rust_lint	5s
test_course_definition / validate-schemas	20s
test_course_definition / validate-stages-naming	8s
test_course_definition / verify_templates_compiled	25s
test_course_definition / test (c)	32s
test_course_definition / test (clojure)	1m 28s
test_course_definition / test (cpp)	1m 26s
test_course_definition / test (crystal)	45s
test_course_definition / test (csharp)	1m 2s
test_course_definition / test (elixir)	46s
test_course_definition / test (gleam)	42s
test_course_definition / test (go)	46s
test_course_definition / test (haskell)	2m 37s
test_course_definition / test (java)	58s
test_course_definition / test (javascript)	31s
test_course_definition / test (php)	39s
test_course_definition / test (python)	24s
test_course_definition / test (ruby)	30s
test_course_definition / test (rust)	1m 8s
test_course_definition / test (scala)	2m 41s
test_course_definition / test (typescript)	54s
test_course_definition / test (zig)	1m 11s
	21m 51s

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