fix: update nginx listen port to 8080 for non-root operation

Non-root users cannot bind to ports < 1024. Port 8080 is used by
nginxinc/nginx-unprivileged by default.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

nginx.conf

@@ -1,5 +1,5 @@
 server {
-    listen 80;
+    listen 8080;
     server_name _;
     root /usr/share/nginx/html;
     index index.html;