just allow ssh-key authentication

multiple/environments/cloud_init.yaml

@@ -1,18 +1,11 @@
 #cloud-config
-# vim: syntax=yaml
-# examples:
-# https://cloudinit.readthedocs.io/en/latest/topics/examples.html
----
-ssh_pwauth: true
-disable_root: false
-chpasswd:
-  list: |
-    root:password
-  expire: false
+disable_root: true
 users:
-  - name: ubuntu
+  - name: groot
     sudo: ALL=(ALL) NOPASSWD:ALL
-    groups: users, admin
-    home: /home/ubuntu
+    groups: wheel,sudo,adm
     shell: /bin/bash
-    lock_passwd: false
+    ssh_authorized_keys:
+      - ssh-rsa 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 lukas@home
+
+ssh_pwauth: false