Update migrations/README.md

Co-authored-by: Steve Chavez <[email protected]>

Author: samrose

migrations/README.md

@@ -130,7 +130,7 @@ After making changes to migrations, you should update the schema.sql files for e
 nix run .#dbmate-tool -- --version all
 ```
 
-This will create a schema.sql file for each major version of PostgreSQL. Commit these changes to your repository and push to your branch. The test.yml workflow will verify these changes against the test matrix.
+This will create a schema.sql file for each major version of PostgreSQL and OrioleDB (the files are named like `schema-<ver>`, `schema-oriole-<ver>`). Commit these changes to your repository and push to your branch. The test.yml workflow will verify these changes against the test matrix.
 ## Testing
 
 Migrations are tested in CI to ensure they do not raise an exception against previously released `supabase/postgres` docker images. The full version matrix is at [test.yml](./.github/workflows/test.yml) in the `supabase-version` variable.