test: postgres storage privs

Author: soedirgo

migrations/tests/storage/privs.sql

@@ -1 +1,19 @@
 select is_member_of('authenticator', 'supabase_storage_admin');
+
+-- postgres can grant storage privileges to custom roles
+create role r;
+grant r to postgres;
+
+set role r;
+select * from storage.buckets;
+
+set role postgres;
+grant usage on schema storage to r;
+grant select on storage.buckets to r;
+
+set role r;
+select * from storage.buckets;
+
+reset role;
+drop owned by r;
+drop role r;