adding env var to npm run command

Author: maknop

Dockerfile

@@ -10,7 +10,7 @@ COPY public ./public
 COPY packages ./packages
 
 RUN npm i
-RUN npm run sitemap
+RUN SITEMAP_BASE_URL=https://developers.redhat.com/api-catalog npm run sitemap
 RUN npm run build
 
 FROM registry.access.redhat.com/ubi9/nginx-124