README.md: add snippets to rke2 examples to download sysext to /etc/e…

…xtensions/rke2.raw

README.md

@@ -330,18 +330,29 @@ variant: flatcar
 version: 1.0.0
 storage:
   links:
+    # filename needs to be rke2.raw
+    - path: /etc/extensions/rke2.raw
+      contents:
+        source: https://github.com/flatcar/sysext-bakery/releases/download/latest/rke2-v1.29.2+rke2r1-x86-64.raw
     - path: /etc/systemd/system/multi-user.target.wants/rke2-server.service
       target: /usr/local/lib/systemd/system/rke2-server.service
       overwrite: true
 ```
 
+Please note that this way you will not get automatic updates via
+`systemd-sysupdate`.
+
 For a rke2 agent (worker node) you would use something like this snippet:
 
 ```yaml
 variant: flatcar
 version: 1.0.0
 storage:
   links:
+    # filename needs to be rke2.raw
+    - path: /etc/extensions/rke2.raw
+      contents:
+        source: https://github.com/flatcar/sysext-bakery/releases/download/latest/rke2-v1.29.2+rke2r1-x86-64.raw
     - path: /etc/systemd/system/multi-user.target.wants/rke2-agent.service
       target: /usr/local/lib/systemd/system/rke2-agent.service
       overwrite: true