Add docker file and python script

Dockerfile

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+FROM python:3-alpine
+# only copy necessary files for better cache
+COPY requirements.txt refresh_cdn.py ./
+RUN python3 --version
+RUN pip3 install -r requirements.txt
+ENTRYPOINT python3 refresh_cdn.py

refresh_cdn.py

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+from tencentcloud.common import credential
+from tencentcloud.common.profile.client_profile import ClientProfile
+from tencentcloud.common.profile.http_profile import HttpProfile
+from tencentcloud.common.exception.tencent_cloud_sdk_exception import TencentCloudSDKException
+from tencentcloud.cdn.v20180606 import cdn_client, models
+import json
+import os
+
+
+def refresh_cdn(secret_id, secret_key, paths, flush_type="flush"):
+    cred = credential.Credential(secret_id, secret_key)
+    http_profile = HttpProfile()
+    http_profile.endpoint = "cdn.tencentcloudapi.com"
+
+    client_profile = ClientProfile()
+    client_profile.httpProfile = http_profile
+    client = cdn_client.CdnClient(cred, "", client_profile)
+
+    req = models.PurgePathCacheRequest()
+    params = {
+        "Paths": paths,
+        "FlushType": flush_type,
+    }
+    params = json.dumps(params)
+    req.from_json_string(params)
+
+    return client.PurgePathCache(req)
+
+
+def parse_env():
+    secret_id = os.getenv("SECRET_ID", None)
+    assert secret_id is not None, "Please provide Secret ID"
+    secret_key = os.getenv("SECRET_KEY", None)
+    assert secret_key is not None, "Please provide Secret Key"
+    paths = os.getenv("PATHS", "")
+    # split and only keep non-whitespaces
+    paths = filter(lambda pth: len(pth) > 0, map(str.strip, paths.split(",")))
+    paths = list(paths)
+    assert len(paths) >= 1, "Please specify at least one path to refresh"
+    flush_type = os.getenv("FLUSH_TYPE", "flush")
+    return secret_id, secret_key, paths, flush_type
+
+
+if __name__ == '__main__':
+    try:
+        resp = refresh_cdn(*parse_env())
+        print("Successfully purged!")
+        print(resp)
+    except TencentCloudSDKException as err:
+        print("Failed to purge:")
+        print(err)
+        exit(-1)

requirements.txt

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+tencentcloud-sdk-python~=3.0.203