fix: restrict template variable substitution

nginx/compose.yaml

@@ -9,6 +9,7 @@ services:
     environment:
       BASE_DOMAIN: ${BASE_DOMAIN}
       EO_ORIGIN_TOKEN: ${EO_ORIGIN_TOKEN}
+      NGINX_ENVSUBST_FILTER: '^(BASE_DOMAIN|EO_ORIGIN_TOKEN)$'
       NGINX_ENVSUBST_OUTPUT_DIR: /etc/nginx
     ports:
       - "192.168.10.101:80:80"