feat(docker): 添加 Docker 使用说明，并在.dockerignore 中包含 config.json

Author: guohuiyuan

.dockerignore

@@ -58,3 +58,5 @@ docs/
 !go.mod
 !go.sum
 !Dockerfile
+config.json
+.env

docker-compose.yml

@@ -11,6 +11,6 @@ services:
       - TZ=Asia/Shanghai
     volumes:
       - ./data:/home/appuser/data
-      - ./config.json:/home/appuser/config.json:ro
+      - ./config.json:/home/appuser/config.json
     command: ["/home/appuser/zerobot-plugin", "-c", "/home/appuser/config.json"]
     user: "1000:1000"