downgrade zulu to 8

Dockerfile

@@ -21,7 +21,7 @@ RUN rpm --import RPM-GPG-KEY-azulsystems
 RUN curl -o /etc/yum.repos.d/zulu.repo http://repos.azulsystems.com/rhel/zulu.repo
 RUN yum -q -qy update \
     && yum -qy install --setopt=tsflags=nodocs epel-release \
-    && yum -qy install zulu-11 curl cronie supervisor \
+    && yum -qy install zulu-8 curl cronie supervisor \
     && yum clean all \
     && rm -rf /var/cache/yum