fix: postgres_fdw: alter fdw owner to postgres

Author: soedirgo

ansible/files/postgresql_extension_custom_scripts/postgres_fdw/after-create.sql

@@ -0,0 +1,21 @@
+do $$
+declare
+  is_super boolean;
+begin
+  is_super = (
+    select usesuper
+    from pg_user
+    where usename = 'postgres'
+  );
+
+  -- Need to be superuser to own FDWs, so we temporarily make postgres superuser.
+  if not is_super then
+    alter role postgres superuser;
+  end if;
+
+  alter foreign data wrapper postgres_fdw owner to postgres;
+
+  if not is_super then
+    alter role postgres nosuperuser;
+  end if;
+end $$;