dockerfile: enable castxml when possible (again)
Return to trying to install castxml into the container image when
possible. This now appears to work (and function) on the centos 8 based
images.
@@ -19,6 +19,7 @@ RUN true && \
git wget curl make \
/usr/bin/cc /usr/bin/c++ \
"libcephfs-devel-${cv}" "librados-devel-${cv}" "librbd-devel-${cv}" && \
+ (dnf install -y 'castxml >= 0.4.3' || true) && \
yum clean all && \
true
