added varnish cache

varnish-cache/Dockerfile

@@ -0,0 +1,14 @@
+FROM centos:7
+RUN yum update -y && yum install -y curl 
+RUN yum install -y epel-release
+RUN curl -s https://packagecloud.io/install/repositories/varnishcache/varnish66/script.rpm.sh | bash
+RUN yum install -y varnish
+RUN yum install -y bind-utils
+RUN yum clean all
+COPY docker-entrypoint.sh /
+RUN chmod +x /docker-entrypoint.sh
+ENTRYPOINT ["/docker-entrypoint.sh"]
+
+
+
+