add docker-compose.yml for discord audit bot configuration

docker-compose.yml

@@ -0,0 +1,23 @@
+services:
+  discord-audit-bot:
+    build: .
+    container_name: police-discord-bot
+    restart: unless-stopped
+    environment:
+      BOT_TOKEN: ${BOT_TOKEN}
+      APP_ID: ${APP_ID}
+      PUBLIC_KEY: ${PUBLIC_KEY}
+      DEFAULT_GUILD_ID: ${DEFAULT_GUILD_ID}
+      ADMIN_KEY: ${ADMIN_KEY}
+      PORT: ${PORT:-3000}
+      MAX_EVENT_AGE_SEC: ${MAX_EVENT_AGE_SEC:-300}
+    ports:
+      - "${PORT:-3000}:3000"
+    read_only: true
+    tmpfs:
+      - /tmp
+    deploy:
+      resources:
+        limits:
+          cpus: "0.25"
+          memory: "128M"