feat(raspberry_pi): add defaults, handlers, and secrets placeholder

roles/raspberry_pi/defaults/main.yaml

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+---
+raspberry_pi_docker_base: /opt/docker
+raspberry_pi_mosquitto_config_dir: "{{ raspberry_pi_docker_base }}/config/mosquitto"
+raspberry_pi_z2m_config_dir: "{{ raspberry_pi_docker_base }}/config/zigbee2mqtt"
+raspberry_pi_compose_dir: "{{ raspberry_pi_docker_base }}/compose"
+raspberry_pi_mosquitto_version: "2"
+raspberry_pi_z2m_version: "2"

roles/raspberry_pi/handlers/main.yaml

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+---
+- name: Restart zigbee2mqtt
+  ansible.builtin.command:
+    cmd: docker compose restart zigbee2mqtt
+    chdir: "{{ raspberry_pi_compose_dir }}"
+  listen: restart zigbee2mqtt
+  when: inventory_hostname == 'naruto'

vars/group_vars/raspberry_pi/secrets.yaml

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+vault_raspberry_pi:
+  zigbee2mqtt:
+    network_key: "GENERATE"