CCM-8985: Fix linting

Author: chris-elliott-nhsd

frontend/next.config.js

@@ -4,6 +4,7 @@ const { PHASE_DEVELOPMENT_SERVER } = require('next/constants');
 const amplifyConfig = require('./amplify_outputs.json');
 
 const basePath = process.env.NEXT_PUBLIC_BASE_PATH ?? '/templates';
+const domain = process.env.NOTIFY_DOMAIN_NAME ?? 'localhost:3000';
 
 const nextConfig = (phase) => {
   const isDevServer = phase === PHASE_DEVELOPMENT_SERVER;