Upload build log to S3

Signed-off-by: Lewis Marshall <lewis@lmars.net>
Ensure build uses the correct dockerfs

Signed-off-by: Lewis Marshall <lewis@lmars.net>
Move daemon code into Runner

Signed-off-by: Lewis Marshall <lewis@lmars.net>
Run builds in parallel

Signed-off-by: Lewis Marshall <lewis@lmars.net>