split sso compose into two compose

.env.sample

@@ -1,5 +1,6 @@
 TYPE=cryptpad
 
+COMPOSE_FILE="compose.yml"
 
 DOMAIN=cryptpad.example.com
 
@@ -17,7 +18,8 @@ SANDBOX_DOMAIN=sandbox.cryptpad.example.com
 #EXTRA_DOMAINS=', `www.cryptpad.example.com`'
 LETS_ENCRYPT_ENV=production
 
-## SSO / OIDC (optional — defaults to false)
+## SSO / OIDC (optional — uncomment below and add compose.sso.yml to COMPOSE_FILE to enable)
+# COMPOSE_FILE="$COMPOSE_FILE:compose.sso.yml"
 #SSO_ENABLED=true
 #SSO_ENFORCED=false
 #SSO_PROVIDER_NAME=Authentik