ignoredFiles

ignoredFiles and includedFiles are file glob matches using https://golang.org/pkg/path/filepath/#Match extended with support for **. If ignoredFiles and changed files are both empty, then they are not used to determine whether or not to trigger a build. If ignoredFiles is not empty, then we ignore any files that match any of the ignored_file globs. If the change has no files that are outside of the ignoredFiles globs, then we do not trigger a build.