Adding orangepi3lts to uptime_kuma/docker; Updating docker playbook to include uptime_kuma group

playbooks/docker.yml

@@ -10,7 +10,9 @@
     - geerlingguy.docker
 
 - name: Ensure python3-docker is installed
-  hosts: ci_servers
+  hosts:
+    - ci_servers
+    - uptime_kuma
   become: true
   tasks:
     - name: Install python3-docker