Base Centos8 build on CC8

Dockerfile_c8

@@ -3,7 +3,7 @@
 #
 # Version 0.1
 
-FROM centos:8
+FROM gitlab-registry.cern.ch/linuxsupport/c8-base:latest
 LABEL maintainer="Mihai Patrascoiu, mihai.patrascoiu@cern.ch, CERN 2020"
 
 # Add extra repositories
@@ -57,9 +57,6 @@ 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 PowerTools; \
-    dnf config-manager --set-enabled fasttrack; \
     dnf -y --nogpg install quarkdb davix; \
     dnf -y --nogpg install \
     eos-server eos-testkeytab eos-client eos-ns-inspect \