add supabase

supabase/volumes/db/realtime.sql

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+\set pguser `echo "$POSTGRES_USER"`
+
+create schema if not exists _realtime;
+alter schema _realtime owner to :pguser;

supabase/volumes/db/roles.sql

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+-- NOTE: change to your own passwords for production environments
+\set pgpass `echo "$POSTGRES_PASSWORD"`
+
+ALTER USER authenticator WITH PASSWORD :'pgpass';
+ALTER USER pgbouncer WITH PASSWORD :'pgpass';
+ALTER USER supabase_auth_admin WITH PASSWORD :'pgpass';
+ALTER USER supabase_storage_admin WITH PASSWORD :'pgpass';