build(docker): Add Docker Compose and Lavalink Configuration

compose.yml

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+# docker-compose.yml
+
+version: '3.8'
+
+services:
+  # The Rust Discord Bot Service
+  app:
+    # Build the image from the Dockerfile in the current directory (.)
+    build: .
+    container_name: discord-bot-app
+    restart: unless-stopped
+    # Pass environment variables from the .env file
+    env_file:
+      - .env
+    # Depend on the lavalink service to ensure it starts first (best practice)
+    depends_on:
+      - lavalink
+
+  # The LavaLink Service
+  lavalink:
+    # Use a Java Runtime Environment image (Alpine base for smaller size)
+    image: eclipse-temurin:17-jre-alpine
+    container_name: lavalink-server
+    restart: unless-stopped
+    # Set the working directory inside the container
+    working_dir: /opt/lavalink
+    # Mount the local Lavalink.jar and application.yml into the container
+    volumes:
+      - ./Lavalink.jar:/opt/lavalink/Lavalink.jar:ro # Mount Jar read-only
+      - ./application.yml:/opt/lavalink/application.yml:ro # Mount config read-only
+      - ./logs:/opt/lavalink/logs # Mount logs directory (optional)
+    # Expose the LavaLink port to the host machine (optional, but useful for debugging)
+    # and makes it reachable by the 'app' service via Docker network.
+    ports:
+      - "2333:2333"
+    # Command to run LavaLink inside the container
+    command: ["java", "-jar", "Lavalink.jar"]
+
+# Define networks (optional, Docker Compose creates a default one)
+# networks:
+#   default:
+#     driver: bridge
+
+# Define volumes (optional, if you need persistent data beyond logs)
+# volumes:
+#   lavalink_logs: