Error return value of `os.Mkdir` is not checked (errcheck)

ineffectual assignment to mimeType (ineffassign)

issues found

Unexpected input(s) 'skip-pkg-cache', valid inputs are ['version', 'install-mode', 'working-directory', 'github-token', 'only-new-issues', 'skip-cache', 'skip-save-cache', 'problem-matchers', 'args', 'cache-invalidation-interval']