feat(docker): add webhook to auto-redeploy on master commit, remove old docker-related files

docker/webhook/Dockerfile

@@ -0,0 +1,3 @@
+FROM python:3-alpine
+COPY receive.py /receive.py
+CMD ["python", "/receive.py"]

docker/webhook/receive.py

@@ -0,0 +1,34 @@
+from http.server import HTTPServer, BaseHTTPRequestHandler
+import os, tarfile, io, shutil, time
+
+SECRET = os.environ["WEBHOOK_SECRET"]
+
+
+class Handler(BaseHTTPRequestHandler):
+    def do_POST(self):
+        if self.headers.get("X-Webhook-Secret") != SECRET:
+            self.send_response(401)
+            self.end_headers()
+            return
+
+        body = self.rfile.read(int(self.headers["Content-Length"]))
+
+        for item in os.listdir("/data"):
+            path = os.path.join("/data", item)
+            if os.path.isdir(path):
+                shutil.rmtree(path)
+            else:
+                os.remove(path)
+
+        with tarfile.open(fileobj=io.BytesIO(body), mode="r:gz") as tar:
+            tar.extractall("/data", filter="data")
+
+        with open("/data/.deploy-timestamp", "w") as f:
+            f.write(str(time.time()))
+
+        self.send_response(200)
+        self.end_headers()
+        self.wfile.write(b"OK")
+
+
+HTTPServer(("0.0.0.0", 9000), Handler).serve_forever()