fix: routerBasename setting (#4891)

.docker/Viewer-v3.x/default.conf.template

@@ -7,7 +7,7 @@ server {
   location / {
     root   /usr/share/nginx/html;
     index  index.html index.htm;
-    try_files $uri $uri/ /index.html;
+    try_files $uri $uri/ ${PUBLIC_URL}index.html;
     add_header Cross-Origin-Resource-Policy same-origin;
     proxy_set_header Host $host;
     proxy_set_header X-Real-IP $remote_addr;