fix: Docker build time was very slow on a tiny change (#4559)

Co-authored-by: sedghi <ar.sedghi@gmail.com>

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

@@ -1,4 +1,7 @@
 server {
+  gzip_static  always;
+  gzip_proxied expired no-cache no-store private auth;
+  gunzip       on;
   listen ${PORT} default_server;
   listen [::]:${PORT} default_server;
   location / {