fix: remove docker-compose.yml from tracking, add example template

docker-compose.yml contains hardcoded credentials (BOT_TOKEN, API_TOKEN,
RESTART_WEBHOOK_URL) and should never be committed. The *compose.yml gitignore
rule already excluded it but docker-compose.example.yml was not provided as a
reference for contributors.

- Add !docker-compose.example.yml negation to .gitignore so example is tracked
- Add docker-compose.example.yml with placeholder values for all secrets

Closes paper-dynasty-database#9

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitignore

@@ -133,6 +133,7 @@ dmypy.json
 storage*
 storage/paper-dynasty-service-creds.json
 *compose.yml
+!docker-compose.example.yml
 **.db
 **/htmlcov
 .vscode/**

docker-compose.example.yml

@@ -0,0 +1,67 @@
+services:
+  discord-app:
+    image: manticorum67/paper-dynasty-discordapp:dev
+    restart: unless-stopped
+    volumes:
+      - /path/to/dev-storage:/usr/src/app/storage
+      - /path/to/dev-logs:/usr/src/app/logs
+    environment:
+      - PYTHONBUFFERED=0
+      - GUILD_ID=your-guild-id-here
+      - BOT_TOKEN=your-bot-token-here
+      # - API_TOKEN=your-old-api-token-here
+      - LOG_LEVEL=INFO
+      - API_TOKEN=your-api-token-here
+      - SCOREBOARD_CHANNEL=your-scoreboard-channel-id-here
+      - TZ=America/Chicago
+      - PYTHONHASHSEED=1749583062
+      - DATABASE=Dev
+      - DB_USERNAME=postgres
+      - DB_PASSWORD=your-db-password-here
+      - DB_URL=db
+      - DB_NAME=postgres
+      - RESTART_WEBHOOK_URL=your-discord-webhook-url-here
+    networks:
+      - backend
+    depends_on:
+      db:
+        condition: service_healthy
+    ports:
+      - 8081:8081
+    healthcheck:
+      test: ["CMD-SHELL", "python3 -c 'import urllib.request; urllib.request.urlopen(\"http://localhost:8081/health\", timeout=5)' || exit 1"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+      start_period: 30s
+
+  db:
+    image: postgres
+    restart: unless-stopped
+    environment:
+      POSTGRES_PASSWORD: your-db-password-here
+    volumes:
+      - pd_postgres:/var/lib/postgresql
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready"]
+      interval: 1s
+      timeout: 5s
+      retries: 5
+    networks:
+      - backend
+
+  adminer:
+    image: adminer
+    restart: always
+    ports:
+      - 8080:8080
+    networks:
+      - backend
+
+
+networks:
+  backend:
+    driver: bridge
+
+volumes:
+  pd_postgres: