feat: 添加 Docker 容器化部署和 CI/CD 管道

- 创建 Flask 应用程序，展示容器主机名和学生ID环境变量
- 配置 DockerFile 为 Python 环境并安装依赖
- 设置 Drone CI 管道自动构建并推送 Docker 映像到私有注册表

.drone.yml

@@ -0,0 +1,27 @@
+kind: pipeline
+type: docker
+name: student-build
+
+steps:
+  - name: docker-build-push
+    image: plugins/docker
+    settings:
+      registry: harbor.seahi.me
+      repo: harbor.seahi.me/stu/whoami-for-swarm
+      tags:
+        - latest
+        - build-${DRONE_BUILD_NUMBER}
+      username:
+        from_secret: harbor_username
+      password:
+        from_secret: harbor_password
+      insecure: true
+      # 添加构建时间标签
+      build_args:
+        - BUILD_DATE=$(date -u +"%Y-%m-%dT%H:%M:%SZ")
+        - VCS_REF=${DRONE_COMMIT_SHA:0:8}
+
+trigger:
+  branch:
+    - main
+

Dockerfile

@@ -0,0 +1,5 @@
+FROM python:3.9-alpine
+RUN pip install flask
+COPY app.py /app.py
+CMD ["python", "/app.py"]
+

app.py

@@ -0,0 +1,16 @@
+from flask import Flask
+import socket
+import os
+
+app = Flask(__name__)
+
+@app.route('/')
+def hello():
+    return f"""
+    容器主机名: {socket.gethostname()}
+    学号服务: s{os.getenv('STUDENT_ID', '00')}
+    """
+
+if __name__ == '__main__':
+    app.run(host='0.0.0.0', port=80)
+