Added SQL scripts for DB change

Signed-off-by: liamfallon <liam.fallon@est.tech>

Author: liamfallon

api/sql/porch-db-1.5.2-1.5.3.sql

@@ -0,0 +1,18 @@
+/*
+Copyright 2025 The kpt and Nephio Authors
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+     http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+ALTER TABLE package_revisions 
+    ADD COLUMN ext_pr_id TEXT NOT NULL
+    DEFAULT '{}';

api/sql/porch-db-1.5.3-1.5.2.sql

@@ -0,0 +1,17 @@
+/*
+Copyright 2025 The kpt and Nephio Authors
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+     http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+ALTER TABLE package_revisions 
+    DROP COLUMN ext_pr_id;