Remove`ci.gitlab.com` from haproxy
We no longer need ssl configuration for ci.gitlab.com, this can be removed from the haproxy cookbook. Original description: According to @jarv, our HAproxy configuration for GitLab.com includes a section for the domain name `ci.gitlab.com` This has no counterpart in gprd and no entry in the DNS. Does it require any action for the migration~2977716 or can we assume it's obsolete and remove the HAProxy configuration currently on GitLab.com ? /cc @jarv
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