Centos / RHEL mirror issue

while using this DOC to install the gitlab runner: https://docs.gitlab.com/runner/install/linux-repository.html

I am receiving this error:

curl -L https://packages.gitlab.com/install/repositories/runner/gitlab-ci-multi-runner/script.rpm.sh | sudo bash
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  7012  100  7012    0     0  38117      0 --:--:-- --:--:-- --:--:-- 38108
Detected operating system as centos/7.
Checking for curl...
Detected curl...
Downloading repository file: https://packages.gitlab.com/install/repositories/runner/gitlab-ci-multi-runner/config_file.repo?os=centos&dist=7&source=script
done.
Installing pygpgme to verify GPG signatures...
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
epel/x86_64/metalink                                                                                                                                                        |  14 kB  00:00:00
 * base: mirror.den01.meanservers.net
 * epel: d2lzkl7pfhq30w.cloudfront.net
 * extras: linux.mirrors.es.net
 * updates: mirror.centos.lax1.serverforge.org
base                                                                                                                                                                        | 3.6 kB  00:00:00
extras                                                                                                                                                                      | 2.9 kB  00:00:00
ius                                                                                                                                                                         | 1.3 kB  00:00:00
runner_gitlab-ci-multi-runner-source/signature                                                                                                                              |  836 B  00:00:00
Retrieving key from https://packages.gitlab.com/runner/gitlab-ci-multi-runner/gpgkey
Importing GPG key 0x51312F3F:
 Userid     : "GitLab B.V. (package repository signing key) <packages@gitlab.com>"
 Fingerprint: f640 3f65 44a3 8863 daa0 b6e0 3f01 618a 5131 2f3f
 From       : https://packages.gitlab.com/runner/gitlab-ci-multi-runner/gpgkey
runner_gitlab-ci-multi-runner-source/signature                                                                                                                              |  951 B  00:00:00 !!!
https://packages.gitlab.com/runner/gitlab-ci-multi-runner/el/7/SRPMS/repodata/repomd.xml: [Errno -1] repomd.xml signature could not be verified for runner_gitlab-ci-multi-runner-source
Trying other mirror.


 One of the configured repositories failed (runner_gitlab-ci-multi-runner-source),
 and yum doesn't have enough cached data to continue. At this point the only
 safe thing yum can do is fail. There are a few ways to work "fix" this:

     1. Contact the upstream for the repository and get them to fix the problem.

     2. Reconfigure the baseurl/etc. for the repository, to point to a working
        upstream. This is most often useful if you are using a newer
        distribution release than is supported by the repository (and the
        packages for the previous distribution release still work).

     3. Run the command with the repository temporarily disabled
            yum --disablerepo=runner_gitlab-ci-multi-runner-source ...

     4. Disable the repository permanently, so yum won't use it by default. Yum
        will then just ignore the repository until you permanently enable it
        again or use --enablerepo for temporary usage:

            yum-config-manager --disable runner_gitlab-ci-multi-runner-source
        or
            subscription-manager repos --disable=runner_gitlab-ci-multi-runner-source

     5. Configure the failing repository to be skipped, if it is unavailable.
        Note that yum will try to contact the repo. when it runs most commands,
        so will have to try and fail each time (and thus. yum will be be much
        slower). If it is a very temporary problem though, this is often a nice
        compromise:

            yum-config-manager --save --setopt=runner_gitlab-ci-multi-runner-source.skip_if_unavailable=true

failure: repodata/repomd.xml from runner_gitlab-ci-multi-runner-source: [Errno 256] No more mirrors to try.