Dumb(but still safe) directory to tar.gz writer

Like tar but without annoying tar:: file changed as we read it. See https://bugzilla.redhat.com/show_bug.cgi?id=1058526#c9 for explanation.

This app aborts file compression if consistency check fails, but not if only atime or permission changed.

Running tests

make build lint test

Building Docker image

make image

Making a release

make release