arr: Add restic backup

roles/arr/templates/docker-compose.yaml.j2

@@ -290,6 +290,26 @@ services:
       caddy: "{{ arrstack_gonic_subdomain }}"
       caddy.reverse_proxy: "{{ '{{' }}upstreams 80{{ '}}'}}"
 
+{% if restic_enable is not undefined and not false and arrstack_restic_enable is not undefined and not false %}
+  backup:
+    image: mazzolino/restic
+    hostname: "{{ ansible_hostname }}"
+    environment:
+      TZ: "{{ restic_tz }}"
+      BACKUP_CRON: "{{ arrstack_restic_cron }}"
+      RESTIC_REPOSITORY: "{{ restic_repo }}"
+      RESTIC_PASSWORD: "{{ restic_pass }}"
+      AWS_ACCESS_KEY_ID: "{{ restic_s3_key }}"
+      AWS_SECRET_ACCESS_KEY: "{{ restic_s3_secret }}"
+      RESTIC_BACKUP_ARGS: >-
+        --tag arr
+      RESTIC_BACKUP_SOURCES: "/backup"
+    volumes:
+{% if restic_repo is regex('^/.+') %}
+      - "{{ restic_repo }}:{{ restic_repo }}"
+{% endif %}
+      - "{{ arrstack_env_dir }}:/backup/{{ arrstack_env_dir }}"
+{% endif %}
 
 networks:
   caddy: