gitlab: use implicit ssl instead of STARTTLS for imap connections

Gitlab uses IMAP to fetch incoming mails. IMAP used to run on port 143
until the recent migration which disabled that port. This change makes
gitlab use port 993 and implicit TLS.

roles/gitlab/tasks/main.yml

@@ -54,8 +54,8 @@
         gitlab_rails['incoming_email_email'] = "gitlab@archlinux.org"
         gitlab_rails['incoming_email_password'] = "{{ vault_gitlab_root_password }}"
         gitlab_rails['incoming_email_host'] = "mail.archlinux.org"
-        gitlab_rails['incoming_email_port'] = 143
-        gitlab_rails['incoming_email_start_tls'] = true
+        gitlab_rails['incoming_email_port'] = 993
+        gitlab_rails['incoming_email_ssl'] = true
         gitlab_rails['omniauth_allow_single_sign_on'] = ['saml']
         gitlab_rails['omniauth_block_auto_created_users'] = false
         gitlab_rails['omniauth_auto_link_saml_user'] = true