Adding CTA CI specific repo serving cached versions of RPMs for

reproducibility.
It serves:
- castor RPMs
- ceph RPMs
- eos RPMs
- others (any other RPMs that may be needed)
- xroot RPMs

continuousintegration/docker/ctafrontend/cc7/etc/yum.repos.d/castor.repo

@@ -3,4 +3,4 @@ name=CASTOR Repositories in LINUXSOFT
 baseurl=http://linuxsoft.cern.ch/internal/repos/castor7-testing/$basearch/os
 enabled=0
 gpgcheck=0
-priority=1
+priority=2

continuousintegration/docker/ctafrontend/cc7/etc/yum.repos.d/cta-ci.repo

+[cta-ci-castor]
+name=CTA CI repo castor cache
+baseurl=https://cta-ci-repo.web.cern.ch/cta-ci-repo/castor/
+priority=2
+gpgcheck=0
+enabled=1
+
+[cta-ci-ceph]
+name=CTA CI repo ceph cache
+baseurl=https://cta-ci-repo.web.cern.ch/cta-ci-repo/ceph/
+priority=3
+gpgcheck=0
+enabled=1
+
+[cta-ci-eos]
+name=CTA CI repo eos cache
+baseurl=https://cta-ci-repo.web.cern.ch/cta-ci-repo/eos/
+priority=4
+gpgcheck=0
+enabled=1
+
+[cta-ci-others]
+name=CTA CI repo any additional needed RPM cache
+baseurl=https://cta-ci-repo.web.cern.ch/cta-ci-repo/others/
+priority=4
+gpgcheck=0
+enabled=1
+
+[cta-ci-xroot]
+name=CTA CI repo xroot cache
+baseurl=https://cta-ci-repo.web.cern.ch/cta-ci-repo/xroot/
+priority=4
+gpgcheck=0
+enabled=1