fix(db): the code-migration runner skips test files

The conversation migration ships with a test beside it, and the runner
treated every numbered .ts file in the folder as a migration, so
migrate:deploy failed on the test. Test files are skipped now.

Author: lindesvard

packages/db/src/code-migrations/migrate.ts

@@ -22,9 +22,11 @@ export async function runCodeMigrations(env: CodeMigrationEnv) {
     .readdirSync(MIGRATIONS_DIR)
     .filter((file) => {
       const version = file.split('-')[0];
+      // A migration's test sits beside it and must not run as a migration.
       return (
         !Number.isNaN(Number.parseInt(version ?? '', 10)) &&
-        file.endsWith('.ts')
+        file.endsWith('.ts') &&
+        !file.endsWith('.test.ts')
       );
     })
     .sort((a, b) => {