Use ed25519 SSH keys

tasks/main.yml

@@ -3,9 +3,10 @@
   user:
     name: root
     generate_ssh_key: true
+    ssh_key_type: ed25519
 
 - name: Get public key
-  command: "cat /root/.ssh/id_rsa.pub"
+  command: "cat /root/.ssh/id_ed25519.pub"
   register: hostkey
   changed_when: false