优化镜像分层

Dockerfile

@@ -11,12 +11,14 @@ ENV PYTHONUNBUFFERED=1 \
     # 设置pip镜像地址，加快安装速度
     PIP_INDEX_URL=https://pypi.tuna.tsinghua.edu.cn/simple
 
-# 安装依赖
+# 安装库
 COPY sources.list /etc/apt/sources.list
-COPY requirements.txt /app/requirements.txt
 RUN ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo '$TZ' > /etc/timezone \
-    && apt-get update && apt-get install libgl1 \
-    && pip install --no-cache-dir -r requirements.txt
+    && apt-get install libgl1
+
+# 安装依赖
+COPY requirements.txt /app/requirements.txt
+RUN pip install --no-cache-dir -r requirements.txt
 
 # 将当前目录内容复制到容器的/app内
 COPY . /app