style: standardize NGINX_ENVSUBST_FILTER quotes

nginx/compose.yaml

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