While convention states that Dockerfile instructions should be written in uppercase, the engine allows them to be mixed case or in lowercase. The tmLanguage file should tolerate this and provide highlighting support even if instructions are not written in uppercase. Signed-off-by: Remy Suen <remy.suen@gmail.com> Upstream-commit: abd39744c6f3ed854500e423f5fabf952165161f Component: engine