FEATURE: add hook and asset path variable

config/nginx.sample.conf

@@ -111,12 +111,13 @@ server {
       break;
     }
 
-    location ~ ^/assets/ {
+    location ~ ^/assets/(?<asset_path>.+)$ {
       expires 1y;
       # asset pipeline enables this
       # brotli_static on;
       gzip_static on;
       add_header Cache-Control public,immutable;
+      # HOOK in asset location (used for extensibility)
       # TODO I don't think this break is needed, it just breaks out of rewrite
       break;
     }