Failed to registry gitlab runner on CentOS 7

After searching a lot on the internet, about the problem I am having when registering the gitlab runner I was able to verify that the problem was related to ssl certificates. I looked for solutions to the problem and came across this solution:

Certificate alternative solution

I did these step by step inside the gitlab container.

Before performing all these procedures the error that appeared when trying to register the runner was this:

After performing the procedure from the link above, the error that appears is this:

And here it is the Docker Compose tha I’m using:

web:
 image: 'gitlab/gitlab-ce:latest'
 restart: always
 hostname: serverIP
 environment:
GITLAB_OMNIBUS_CONFIG: |
  external_url 'https://serverIP'
ports:
- '80:80'
- '443:443'
volumes:
- '$GITLAB_HOME/config:/etc/gitlab'
- '$GITLAB_HOME/logs:/var/log/gitlab'
- '$GITLAB_HOME/data:/var/opt/gitlab'
runner:
 restart: always
 image: 'gitlab/gitlab-runner:alpine'
volumes:
- './gitlab/runner:/etc/gitlab-runner:Z'
register-runner:
restart: 'no'
image: 'gitlab/gitlab-runner:alpine'
volumes:
- './gitlab/runner:/etc/gitlab-runner:Z'
command:
 - register
- '--non-interactive'
- '--locked=false'
- '--name=Docker Runner'
- '--executor=docker'
- '--docker-volumes=/var/run/docker.sock:/var/run/docker.sock'
environment:
- 'CI_SERVER_URL=https://serversIP/'
- REGISTRATION_TOKEN=see_gitlab_admin_runner_setup

I don’t know what it means, nor how to solve it. And I also don’t know what this IP SANs means or what it is. Thank you in advance who can take some of your time to help me solve this problem