(apple ssl) model write method after the OpenSSL one for consistency

More test code for #140.

test/compatibility/python/websockets/Dockerfile

@@ -1,8 +1,14 @@
 FROM python:3.8.0-alpine3.10
 
 RUN pip install websockets
-COPY ws_proxy.py /usr/bin
-RUN chmod +x /usr/bin/ws_proxy.py
+COPY *.py /usr/bin/
+COPY entrypoint.sh /usr/bin/
+RUN chmod +x /usr/bin/*.py
 
-EXPOSE 8765
-CMD ["python", "/usr/bin/ws_proxy.py"]
+RUN mkdir /certs
+COPY *.pem /certs/
+
+WORKDIR /certs
+
+EXPOSE 8765 8766
+CMD ["sh", "/usr/bin/entrypoint.sh"]