docker file better

Dockerfile

@@ -1,6 +1,9 @@
-FROM python:3
-FROM gorialis/discord.py
+FROM alpine
+ENV PYTHONUNBUFFERED=1
+RUN apk add --update --no-cache python3 && ln -sf python3 /usr/bin/python
+RUN python3 -m ensurepip
+RUN pip3 install --no-cache --upgrade pip setuptools discord.py
 RUN mkdir -p /usr/src/bot
 WORKDIR /usr/src/bot
 COPY . .
-CMD [ "python3", "bot.py" ]
+CMD [ "python", "bot.py" ]