Do everything from dockerbuild script

script/cibuild-atom-rpm

@@ -2,9 +2,5 @@
 
 set -ex
 
-rm -f atom-rpm.cid
 docker build -t atom-rpm .
-docker run --cidfile='atom-rpm.cid' atom-rpm /atom/script/dockerbuild
-
-CONTAINER_ID=`cat atom-rpm.cid`
-docker cp "$CONTAINER_ID:/tmp/atom-build/rpm" .
+docker run atom-rpm /atom/script/dockerbuild