add: docker compose code

README.md

@@ -127,6 +127,33 @@ RANKINGS_STATE_PATH=/data/rankings-state.json npm start
 In a containerized setup, mount `/data` as a named volume or bind mount.
 If you reverse-proxy the app through Caddy on the same domain, the rankings page will use the shared API automatically with no extra CORS setup.
 
+The current server deployment lives one directory up from this repo in `~/docker/websites/docker-compose.yml` and uses this `gallery` service definition:
+
+```yaml
+services:
+  gallery:
+    build:
+      context: ./gallery-src
+    container_name: gallery
+    environment:
+      HOST: 0.0.0.0
+      PORT: 80
+      RANKINGS_STATE_PATH: /data/rankings-state.json
+    volumes:
+      - gallery-rankings:/data
+    restart: unless-stopped
+    networks:
+      - web
+
+networks:
+  web:
+    external: true
+    name: web
+
+volumes:
+  gallery-rankings:
+```
+
 ## Image Conventions
 
 - Full-size images and thumbnails share the same numeric ID