优化 Dockerfile 大幅减少镜像体积 (#729)

Dockerfile

@@ -1,15 +1,18 @@
-FROM python:3.9 as builder
-RUN apt-get update && apt-get install -y build-essential
+FROM python:3.9-slim-buster as builder
+RUN apt-get update \
+    && apt-get install -y build-essential \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/*
 COPY requirements.txt .
 COPY requirements_advanced.txt .
-RUN pip install --user -r requirements.txt
-# RUN pip install --user -r requirements_advanced.txt
+RUN pip install --user --no-cache-dir -r requirements.txt
+# RUN pip install --user --no-cache-dir -r requirements_advanced.txt
 
-FROM python:3.9
-MAINTAINER iskoldt
+FROM python:3.9-slim-buster
+LABEL maintainer="iskoldt"
 COPY --from=builder /root/.local /root/.local
 ENV PATH=/root/.local/bin:$PATH
 COPY . /app
 WORKDIR /app
-ENV dockerrun yes
-CMD ["python3", "-u", "ChuanhuChatbot.py", "2>&1", "|", "tee", "/var/log/application.log"]
+ENV dockerrun=yes
+CMD ["python3", "-u", "ChuanhuChatbot.py","2>&1", "|", "tee", "/var/log/application.log"]