jmri: add rblundon@laptop SSH key for xpra access

Adds jmri_ssh_authorized_keys_extra list to support multiple authorized
keys on the jmri account. Deploys rblundon's MacBook key so xpra can
connect via SSH without a password.

ansible/roles/jmri/tasks/main.yml

@@ -30,6 +30,13 @@
     state: present
   when: jmri_ssh_authorized_key | length > 0
 
+- name: Deploy extra SSH authorized keys for jmri user
+  ansible.posix.authorized_key:
+    user: "{{ jmri_user }}"
+    key: "{{ item }}"
+    state: present
+  loop: "{{ jmri_ssh_authorized_keys_extra }}"
+
 - name: Add JMRI user to dialout group (serial device access)
   ansible.builtin.user:
     name: "{{ jmri_user }}"