Add S3 CDN media readiness and cache health checks

src/config/configuration.ts

@@ -89,6 +89,8 @@ export default () => ({
       accessKeyId: process.env.S3_ACCESS_KEY_ID ?? '',
       secretAccessKey: process.env.S3_SECRET_ACCESS_KEY ?? '',
       forcePathStyle: (process.env.S3_FORCE_PATH_STYLE ?? 'false').toLowerCase() === 'true',
+      healthWriteTestEnabled:
+        (process.env.S3_HEALTH_WRITE_TEST_ENABLED ?? 'false').toLowerCase() === 'true',
     },
   },
   imageProcessing: {