feat: add example usage of docker-compose.yml to README

Dockerfile

@@ -26,6 +26,11 @@ RUN chmod +x /usr/local/bin/entrypoint.sh
 # Copy built frontend into the expected location: /app/frontend/dist
 COPY --from=frontend-build /app/frontend/dist ./frontend/dist
 
+# runtime environment (DATA_DIR used at runtime; DATABASE_URL points to it)
+ENV NODE_ENV=production
+ENV DATA_DIR=/data
+ENV DATABASE_URL="file:${DATA_DIR}/sqlite.db"
+
 WORKDIR /app/backend
 EXPOSE 3000
 

README.md

@@ -0,0 +1,16 @@
+Here is example usage of `docker-compose.yml`:
+
+```yaml
+service
+  tally-counter:
+    image: gitea.kanawave.net/sebastas/tally-counter:latest     #this image
+    container_name: tally-counter
+    user: 2000:2000 #uid:gid
+    restart: unless-stopped
+    networks:
+      - proxy   # traefik proxy network
+    volumes:
+      - ./tally-counter:/data   # for persistant storage (db + uploads)
+```
+
+Quick and dirty setup!