Explain asset bridging

lib/kamal/cli/templates/deploy.yml

@@ -73,3 +73,8 @@ registry:
 # healthcheck:
 #   path: /healthz
 #   port: 4000
+
+# Bridge fingerprinted assets, like JS and CSS, between versions to avoid
+# hitting 404 on in-flight requests. Combines all files from new and old
+# version inside the asset_path.
+# asset_path: /rails/public/assets