Add 11-6 job to CI configuration
What does this MR do?
It adds the 11.6 job to the CI configuration, as instructed in https://gitlab.com/gitlab-org/security-products/release/blob/master/docs/release_process.md
It adds the 11.6 job to the CI configuration, as instructed in https://gitlab.com/gitlab-org/security-products/release/blob/master/docs/release_process.md