Remove upgrade of packages in Dockerfile for ubi

Author: Rulox

build/openshift/Dockerfile

@@ -20,7 +20,6 @@ RUN set -x \
 	&& echo "gpgcheck=0" >> /etc/yum.repos.d/nginx.repo \
 	&& echo "enabled=1" >> /etc/yum.repos.d/nginx.repo \
 	&& echo "module_hotfixes=true" >> /etc/yum.repos.d/nginx.repo \
-	&& yum update -y \
 	&& yum install -y nginx-${NGINX_VERSION} \
 	&& mkdir -p /var/lib/nginx \
 	&& mkdir -p /etc/nginx/secrets \