[BEAM-13546][Playground] Update nginx configuration to enable embedding iframes

playground/frontend/Dockerfile

@@ -36,3 +36,4 @@ FROM nginx:1.21.3
 COPY --from=build /app/nginx_default.conf /etc/nginx/conf.d/default.conf
 COPY --from=build /app/build/web/ /usr/share/nginx/html
 RUN cp /usr/share/nginx/html/assets/assets/* /usr/share/nginx/html/assets/
+RUN gzip -kr /usr/share/nginx/html/assets/*

playground/frontend/nginx_default.conf

@@ -20,11 +20,19 @@ server {
     listen       8080;
     server_name  localhost;
 
+    root /usr/share/nginx/html;
+
+    gzip_static on;
+
     location / {
-        root   /usr/share/nginx/html;
-        index  index.html index.htm;
+        try_files $uri /index.html;
     }
 
+    location = /index.html {
+       expires 30s;
+    }
+
+
     error_page   500 502 503 504  /50x.html;
     location = /50x.html {
         root   /usr/share/nginx/html;