Speed up Docker apt install with configurable mirror.

Add APT_MIRROR build arg to switch Debian source before apt-get update, and document faster build command using BuildKit and host network.

Co-authored-by: Cursor <cursoragent@cursor.com>

Dockerfile

@@ -1,7 +1,10 @@
 FROM node:20-bookworm-slim
 
+ARG APT_MIRROR=mirrors.aliyun.com
 ENV DEBIAN_FRONTEND=noninteractive
 
+RUN sed -i "s|deb.debian.org|${APT_MIRROR}|g; s|security.debian.org|${APT_MIRROR}|g" /etc/apt/sources.list.d/debian.sources
+
 RUN apt-get update \
     && apt-get install -y --no-install-recommends python3 python3-pip ca-certificates git \
     && rm -rf /var/lib/apt/lists/*

README.md

@@ -69,6 +69,14 @@ npm run dev
 docker build -t media-crawler:latest .
 ```
 
+构建较慢时可使用加速参数（BuildKit + host 网络 + 可选 apt 镜像）：
+
+```bash
+DOCKER_BUILDKIT=1 docker build --network=host \
+  --build-arg APT_MIRROR=mirrors.aliyun.com \
+  -t media-crawler:latest .
+```
+
 ### 运行容器
 
 ```bash