feat(send): add role for self-hosted Send file-share service

Deploys timvisee/send with a Redis backend behind Traefik. Supports
local-disk or S3 storage (e.g. via the garage role). Uses the shared
`*_domains` list convention so the router can accept internal *.int.*
names alongside the canonical BASE_URL host.

roles/send/templates/docker-compose.yml.j2

@@ -0,0 +1,69 @@
+services:
+  {{ send_service_name }}:
+    image: {{ send_image }}
+    container_name: {{ send_service_name }}
+    restart: unless-stopped
+    depends_on:
+      - {{ send_redis_service_name }}
+    networks:
+      - {{ send_traefik_network }}
+      - {{ send_internal_network }}
+{% if send_extra_hosts is defined and send_extra_hosts | length > 0 %}
+    extra_hosts:
+{% for host in send_extra_hosts %}
+      - "{{ host }}"
+{% endfor %}
+{% endif %}
+    environment:
+{% if send_use_ssl %}
+      BASE_URL: "https://{{ send_domains[0] }}"
+{% else %}
+      BASE_URL: "http://{{ send_domains[0] }}"
+{% endif %}
+      REDIS_HOST: "{{ send_redis_service_name }}"
+      REDIS_PORT: "6379"
+      MAX_FILE_SIZE: "{{ send_max_file_size }}"
+      DEFAULT_DOWNLOADS: "{{ send_default_downloads }}"
+      MAX_DOWNLOADS: "{{ send_max_downloads }}"
+      DEFAULT_EXPIRE_SECONDS: "{{ send_default_expire_seconds }}"
+      MAX_EXPIRE_SECONDS: "{{ send_max_expire_seconds }}"
+      MAX_FILES_PER_ARCHIVE: "{{ send_max_files_per_archive }}"
+      DOWNLOAD_COUNTS: "{{ send_download_counts }}"
+      EXPIRE_TIMES_SECONDS: "{{ send_expire_times_seconds }}"
+{% if send_storage_backend == "s3" %}
+      S3_BUCKET: "{{ send_s3_bucket }}"
+      S3_ENDPOINT: "{{ send_s3_endpoint }}"
+      S3_USE_PATH_STYLE_ENDPOINT: "{{ 'true' if send_s3_use_path_style else 'false' }}"
+      AWS_ACCESSKEYID: "{{ send_s3_access_key }}"
+      AWS_SECRETACCESSKEY: "{{ send_s3_secret_key }}"
+      AWS_REGION: "{{ send_s3_region }}"
+{% else %}
+      FILE_DIR: "/uploads"
+    volumes:
+      - {{ send_docker_volume_dir }}/uploads:/uploads
+{% endif %}
+    labels:
+      - traefik.enable=true
+      - traefik.docker.network={{ send_traefik_network }}
+      - traefik.http.routers.{{ send_service_name }}.rule=Host({% for d in send_domains %}`{{ d }}`{% if not loop.last %}, {% endif %}{% endfor %})
+      - traefik.http.services.{{ send_service_name }}.loadbalancer.server.port={{ send_port }}
+{% if send_use_ssl %}
+      - traefik.http.routers.{{ send_service_name }}.entrypoints=websecure
+      - traefik.http.routers.{{ send_service_name }}.tls=true
+{% else %}
+      - traefik.http.routers.{{ send_service_name }}.entrypoints=web
+{% endif %}
+
+  {{ send_redis_service_name }}:
+    image: {{ send_redis_image }}
+    container_name: {{ send_redis_service_name }}
+    restart: unless-stopped
+    networks:
+      - {{ send_internal_network }}
+    volumes:
+      - {{ send_docker_volume_dir }}/redis:/data
+
+networks:
+  {{ send_internal_network }}:
+  {{ send_traefik_network }}:
+    external: true