change to id_ed25519 keys

tasks/configure_certificates.yml

@@ -50,15 +50,15 @@
 
 - name: Check if there is a public key
   stat:
-    path: /root/.ssh/id_rsa.pub
+    path: /root/.ssh/id_ed25519.pub
   register: pubkey
 
 - name: Generate new key if it doesn't exist already
-  shell: ssh-keygen -t rsa -b 4096 -f /root/.ssh/id_rsa -N ''
+  shell: ssh-keygen -t ed25519 -f /root/.ssh/id_ed25519 -N ''
   when: not pubkey.stat.exists
 
 - name: Get SSH public key content
-  shell: cat /root/.ssh/id_rsa.pub
+  shell: cat /root/.ssh/id_ed25519.pub
   register: ssh_pubkey
 
 - name: Add SSH public key to local (Ansible control node) file