Try conditional to create schema

lib/App/Sqitch/Engine/snowflake.sql

@@ -1,4 +1,15 @@
-CREATE SCHEMA IF NOT EXISTS &registry;
+-- Create the schema but ignore permission errors
+EXECUTE IMMEDIATE $$
+BEGIN
+    IF (NOT EXISTS(SELECT * FROM information_schema.schemata WHERE schema_name = UPPER('&registry'))) THEN
+        CREATE SCHEMA identifier('&registry');
+        -- COMMENT ON SCHEMA identifier('&registry') IS 'Sqitch database deployment metadata v1.1.';
+    END IF;
+-- EXCEPTION WHEN statement_error THEN
+--     IF (sqlstate = '42501') THEN RETURN ''; END IF;
+END;
+$$;
+
 
 COMMENT ON SCHEMA &registry IS 'Sqitch database deployment metadata v1.1.';