temporary fix for yum issue

Author: markxnelson

wercker.yml

@@ -55,6 +55,7 @@ build:
       rpm -e --nodeps tar 
       rpm -e --nodeps gzip 
       yum clean all
+      rm -rf /var/cache/yum
   # push the image to quay.io using the GIT branch as the tag
   # this image needs to be available to the integration-test pipeline for testing
   - internal/docker-push: