Add dockerfile.

Author: benwoo1110

Dockerfile

@@ -0,0 +1,16 @@
+FROM python:3.9-slim
+ENV PYTHONPATH=/bot PYTHONUNBUFFERED=1
+WORKDIR /bot
+
+COPY . .
+
+RUN set -x \
+  && adduser --system --group --home "$PWD" --shell /bin/sh --no-create-home --disabled-password bot-user \
+  && chown -R bot-user:bot-user . \
+  && su bot-user -c "python3 -m venv venv" \
+  && su bot-user -c "venv/bin/pip install --upgrade pip wheel" \
+  && su bot-user -c "venv/bin/pip install --requirement requirements.txt" \
+  && rm -rf .cache
+
+USER bot-user
+ENTRYPOINT ["/bot/venv/bin/python", "bot.py"]