fix(ci): fix nginx deploy conf

deploy/nginx/frontend.production.conf

@@ -8,7 +8,6 @@ server {
     client_max_body_size 20m;
 
     add_header X-Content-Type-Options nosniff always;
-    add_header X-Frame-Options SAMEORIGIN always;
     add_header Referrer-Policy strict-origin-when-cross-origin always;
 
     location = /chat-widget.js {
@@ -30,6 +29,8 @@ server {
     }
 
     location /admin/ {
+        add_header X-Frame-Options SAMEORIGIN always;
+
         proxy_pass http://backend:8000/admin/;
         proxy_http_version 1.1;
         proxy_set_header Host $host;
@@ -52,6 +53,7 @@ server {
     }
 
     location / {
+        add_header X-Frame-Options SAMEORIGIN always;
         try_files $uri $uri/ /index.html;
     }
 }