tests: update packages to keep ceph common and libraries in sync

Sometimes the version in the RPM repository don't match the version
of the base image. This change updates the packages before installing
the libraries in order to make them match.

Signed-off-by: Sven Anderson <sven@redhat.com>

testing/containers/ceph/Dockerfile

@@ -4,12 +4,13 @@ FROM ceph/daemon-base:latest-${CEPH_VERSION:-octopus}
 ENV CEPH_VERSION=${CEPH_VERSION:-octopus}
 
 RUN true && \
-    yum clean all && \
+    yum update -y && \
     cv="$(rpm -q --queryformat '%{version}-%{release}' ceph-common)" && \
     yum install -y \
         git wget curl make \
         /usr/bin/cc /usr/bin/c++ \
         "libcephfs-devel-${cv}" "librados-devel-${cv}" "librbd-devel-${cv}" && \
+    yum clean all && \
     true
 
 ENV GOTAR=go1.15.10.linux-amd64.tar.gz