Add --rm flag

script/cibuild-atom-rpm

@@ -4,6 +4,7 @@ set -e
 
 docker build -t atom-rpm .
 docker run \
+ --rm \
  --env JANKY_SHA1="$JANKY_SHA1" \
  --env JANKY_BRANCH="$JANKY_BRANCH" \
  --env ATOM_ACCESS_TOKEN="$BUILD_ATOM_RPM_ACCESS_TOKEN" \