fix: request failures when work_mem is set on a role

test/io/fixtures/roles.sql

@@ -8,11 +8,12 @@ CREATE ROLE postgrest_test_author;
 CREATE ROLE postgrest_test_serializable;
 CREATE ROLE postgrest_test_repeatable_read;
 CREATE ROLE postgrest_test_w_superuser_settings;
+CREATE ROLE postgrest_test_work_mem;
 
 GRANT
   postgrest_test_anonymous, postgrest_test_author,
   postgrest_test_serializable, postgrest_test_repeatable_read,
-  postgrest_test_w_superuser_settings TO :"PGUSER";
+  postgrest_test_w_superuser_settings, postgrest_test_work_mem TO :"PGUSER";
 
 ALTER ROLE :"PGUSER" SET pgrst.db_anon_role = 'postgrest_test_anonymous';
 ALTER ROLE postgrest_test_serializable SET default_transaction_isolation = 'serializable';
@@ -23,3 +24,5 @@ ALTER ROLE postgrest_test_w_superuser_settings SET log_min_messages = 'fatal';
 
 ALTER ROLE postgrest_test_anonymous SET statement_timeout TO '5s';
 ALTER ROLE postgrest_test_author SET statement_timeout TO '10s';
+
+ALTER ROLE postgrest_test_work_mem SET work_mem TO '3MB';

test/io/fixtures/schema.sql

@@ -265,3 +265,7 @@ create or replace function custom_vary_hdr() returns void as $$
     perform set_config('response.headers', '[{"Vary": "X-Test-Accept"}]', false);
   end
 $$ language plpgsql;
+
+create or replace function get_work_mem() returns text as $$
+  select current_setting('work_mem', true);
+$$ language sql;