Fix typo

Dockerfile_c8

@@ -57,7 +57,7 @@ ADD c8_artifacts ${EOSREPODIR}
 # Special packages, must be installed un-cached
 RUN createrepo ${EOSREPODIR}; \
     echo -e "[eos-artifacts]\nname=EOS artifacts\nbaseurl=file://${EOSREPODIR}\ngpgcheck=0\nenabled=1\npriority=1" >> /etc/yum.repos.d/eos.repo; \
-    dnf config-manager --set-enabled epel-testing
+    dnf config-manager --set-enabled epel-testing; \
     dnf -y --nogpg install quarkdb davix; \
     dnf -y --nogpg install \
     eos-server eos-testkeytab eos-client eos-ns-inspect \