does locking fix it?

Author: juleswritescode

crates/pgt_test_utils/testdb_migrations/0001_setup-roles.sql

@@ -1,6 +1,8 @@
 do $$
 begin
 
+select pg_advisory_lock(12345);
+
 if not exists (
   select from pg_catalog.pg_roles
   where rolname = 'admin'
@@ -22,5 +24,7 @@ if not exists (
   create role test_nologin;
 end if;
 
+select pg_advisory_unlock(12345);
+
 end 
 $$;