add rsync to dependencies

Author: matthewhanson

Dockerfile

@@ -6,7 +6,7 @@ LABEL authors="Matthew Hanson  <[email protected]>"
 # install system libraries
 RUN \
     yum makecache fast; \
-    yum install -y wget libpng-devel nasm; \
+    yum install -y wget libpng-devel nasm rsync; \
     yum install -y bash-completion --enablerepo=epel; \
     yum clean all; \
     yum autoremove