fix(docker): simplify migrate command, remove heredoc

Replace shell heredoc with multiple -c flags for psql. Heredoc syntax
can cause issues in some Docker Compose implementations.

docker-compose.yml

@@ -53,16 +53,7 @@ services:
     command:
       - |
         echo "🔑 Ensuring role passwords are set (idempotent)..."
-        psql -h supabase-db -U supabase_admin -d postgres -v ON_ERROR_STOP=0 <<-EOSQL
-          ALTER ROLE authenticator WITH LOGIN PASSWORD '${POSTGRES_PASSWORD}';
-          ALTER ROLE supabase_storage_admin WITH LOGIN PASSWORD '${POSTGRES_PASSWORD}';
-          ALTER ROLE supabase_auth_admin WITH LOGIN PASSWORD '${POSTGRES_PASSWORD}';
-          ALTER ROLE dashboard_user WITH LOGIN PASSWORD '${POSTGRES_PASSWORD}';
-          ALTER ROLE postgres WITH PASSWORD '${POSTGRES_PASSWORD}';
-          CREATE SCHEMA IF NOT EXISTS _realtime;
-          GRANT ALL ON SCHEMA _realtime TO supabase_admin;
-          GRANT USAGE ON SCHEMA _realtime TO postgres, anon, authenticated, service_role;
-        EOSQL
+        psql -h supabase-db -U supabase_admin -d postgres -v ON_ERROR_STOP=0 -c "ALTER ROLE authenticator WITH LOGIN PASSWORD '${POSTGRES_PASSWORD}';" -c "ALTER ROLE supabase_storage_admin WITH LOGIN PASSWORD '${POSTGRES_PASSWORD}';" -c "ALTER ROLE supabase_auth_admin WITH LOGIN PASSWORD '${POSTGRES_PASSWORD}';" -c "ALTER ROLE dashboard_user WITH LOGIN PASSWORD '${POSTGRES_PASSWORD}';" -c "ALTER ROLE postgres WITH PASSWORD '${POSTGRES_PASSWORD}';" -c "CREATE SCHEMA IF NOT EXISTS _realtime;" -c "GRANT ALL ON SCHEMA _realtime TO supabase_admin;" -c "GRANT USAGE ON SCHEMA _realtime TO postgres, anon, authenticated, service_role;" 2>&1 || true
         echo ""
         echo "Running app migrations..."
         for sql in /app-migrations/*.sql; do