Fix unclosed connection bug

Migrations were opening a client connection without releasing it.  This
means tests would hang at the very least.  It is also why we were forced
to manually exit the migration process.

Author: slifty

src/database/migrate.ts

@@ -8,4 +8,5 @@ export const migrate = async (): Promise<void> => {
     { client },
     path.resolve(__dirname, 'migrations'),
   );
+  client.release();
 };

src/scripts/migrate.ts

@@ -6,8 +6,7 @@ const logger = root_logger.child({ source: 'migrate' });
 logger.info('Starting migrations...');
 migrate()
   .then(() => {
-    logger.info('Migrations complete.');
-    process.exit();
+    process.stdout.write('Migrations complete.\n');
   })
   .catch((reason: unknown) => {
     logger.error('Migrations failed!');