fix undefined sso var in template

.env.sample

@@ -12,7 +12,9 @@ GITLAB_CONF_VERSION=v1
 GITLAB_ROOT_EMAIL="gitlab_admin@example.com"
 SECRET_INITIAL_ROOT_PASSWORD_VERSION=v1
 
+SSO=false
 ## Authentik Configuration
+# SSO=true
 # SSO_PROVIDER_HOST="authentik.mydomain.com"
 # ORG_NAME="My Organization"
 # SECRET_CLIENT_SSO_SECRET_VERSION=v1

gitlab.rb.tmpl

@@ -550,7 +550,7 @@
 # gitlab_rails['smartcard_required_for_git_access'] = false
 # gitlab_rails['smartcard_san_extensions'] = false
 
-{{ if SSO_PROVIDER_HOST }}
+{{ if eq SSO "true" }}
 ### OmniAuth Settings
 ###! Docs: https://docs.gitlab.com/ee/integration/omniauth.html
 # gitlab_rails['omniauth_enabled'] = nil