feat: add docker

docker-compose.yml

@@ -0,0 +1,31 @@
+services:
+  sb-ruleset-sync:
+    build:
+      context: .
+      dockerfile: ./docker/Dockerfile
+    container_name: sb-ruleset-sync
+    restart: unless-stopped
+
+    # Mount volumes:
+    # - The local `rules` directory is mounted into the container, so downloaded
+    #   files persist between container restarts.
+    # - The `template.json` is mounted as read-only for security.
+    volumes:
+      - ./template.json:/config/template.json:ro
+      - ./rules:/rules
+
+    environment:
+      - TZ=Europe/Moscow
+      # Optional: Set the user and group ID for the 'app' user inside the container.
+      # Match this to your host user (`id -u` and `id -g`) to avoid file permission
+      # issues on the mounted `./rules` volume.
+      - PUID=1000
+      - PGID=1000
+
+    # A healthcheck to ensure the cron daemon is running.
+    healthcheck:
+      test: ["CMD", "pgrep", "crond"]
+      interval: 1m
+      timeout: 10s
+      retries: 3
+      start_period: 10s