Increase cache limits | refs #33416

ansible/roles/mediacache/templates/mediacache.j2

-proxy_cache_path {{ mediacache_folder }} levels=1:2 keys_zone=mediacache:10m max_size={{ mediacache_size }}g inactive=300s;
+# Cache configuration
+#  Maximum retention of 30 days
+#  4G of RAM for keys zone (one megabyte can store about 8 thousand keys)
+#  https://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_cache_path
+proxy_cache_path {{ mediacache_folder }} levels=1:2 keys_zone=mediacache:4000m max_size={{ mediacache_size }}g inactive=30d;
 
 server {
     listen 80 default_server;
@@ -64,7 +68,7 @@ server {
             proxy_cache_lock on;
 
             # how long should the data be kept in the cache
-            proxy_cache_valid 200 7d;
+            proxy_cache_valid 200 30d;
 
             # instruct browser to cache this
             expires 7d;