DBC22-1877: Set image expiry to modified time

Author: wmuldergov

compose/frontend/default.conf

@@ -44,6 +44,8 @@ server {
     location /images/ {
         alias /app/images/webcams/;
         try_files $uri =404;
+        expires    modified +1s;
+        add_header Last-Modified "";
     }
 
     proxy_cache cache;