[CI]: update the source for EPEL7 repo

The Fedore project has recently change the location of old EPEL repos, including EPEL7:

- we need to add EPEL as a repo (not a file) from https://archives.fedoraproject.org/pub/archive/epel/7

issue: HPCINFRA-HPCINFRA-2456

Signed-off-by: Viacheslav Login <[email protected]>

Author: Viacheslav Login

.ci/dockerfiles/Dockerfile.rhel8.6

@@ -4,8 +4,9 @@ ARG _GID=101
 ARG _LOGIN=swx-jenkins
 ARG _HOME=/var/home/$_LOGIN
 
-RUN yum install -y https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm \
- && yum install -y cppcheck \
+RUN yum install -y yum-utils \
+ && yum-config-manager --add-repo https://archives.fedoraproject.org/pub/archive/epel/7/x86_64/ \
+ && yum --nogpgcheck install -y cppcheck \
  && yum install -y https://dl.fedoraproject.org/pub/epel/epel-release-latest-8.noarch.rpm \
  && yum install -y csbuild clang-tools-extra sudo curl autoconf automake make libtool \
     libnl3-devel libnl3 rdma-core-devel rdma-core bc \