improve minecraft performance by using a non nfs volume for live data

apps/minecraft/README.md

@@ -1,3 +1,11 @@
+## Setup
+Because minecraft is quite sensitive to io performance, we want the data to be stored on a local disk. But hostpath is not well supported in talos (and is not persistent), so we use an ephemeral volume instead. In order to do this, we create an emptyDir volume and mount it to the pod.
+
+We use an initContaier that copies the data to the local storage. Afterwards, copying from the local storage back to the persistent storage is handled by a preStop lifecycle event.
+
+This way, we can have the best of both worlds: fast local storage and persistent storage.
+
+
 ## Sending a command
 ```
 kubectl exec -it -n minecraft deploy/minecraft-server -- /bin/bash