每次构建都得重新下载，跟文档上说明不一致

https://developers.weixin.qq.com/miniprogram/dev/wxcloudservice/wxcloudrun/src/scene/build/speed.html#%E5%A6%82%E4%BD%95%E6%8F%90%E5%8D%87%E9%95%9C%E5%83%8F%E7%9A%84%E6%9E%84%E5%BB%BA%E6%95%88%E7%8E%87

[2025-02-14 11:27:17] #6 [ 2/20] RUN apk add tzdata && cp /usr/share/zoneinfo/Asia/Shanghai /etc/localtime && echo Asia/Shanghai > /etc/timezone
[2025-02-14 11:27:18] #6 0.308 fetch https://dl-cdn.alpinelinux.org/alpine/v3.20/main/x86_64/APKINDEX.tar.gz
[2025-02-14 11:27:18] #6 0.612 fetch https://dl-cdn.alpinelinux.org/alpine/v3.20/community/x86_64/APKINDEX.tar.gz
[2025-02-14 11:27:18] #6 1.118 (1/1) Installing tzdata (2025a-r0)
[2025-02-14 11:27:19] #6 1.223 OK: 22 MiB in 40 packages
[2025-02-14 11:27:19] #6 DONE 1.6s
[2025-02-14 11:27:19] 
[2025-02-14 11:27:19] #7 [ 3/20] RUN apk add ca-certificates
[2025-02-14 11:27:20] #7 0.780 OK: 22 MiB in 40 packages
[2025-02-14 11:27:20] #7 DONE 0.9s
[2025-02-14 11:27:20] 
[2025-02-14 11:27:20] #8 [ 4/20] RUN sed -i 's/dl-cdn.alpinelinux.org/mirrors.tencentyun.com/g' /etc/apk/repositories
[2025-02-14 11:27:20] #8 DONE 0.5s
[2025-02-14 11:27:20] 
[2025-02-14 11:27:20] #9 [ 5/20] RUN apk add --no-cache nginx curl pcre-dev autoconf dpkg-dev dpkg file g++ gcc libc-dev make pkgconf re2c
[2025-02-14 11:27:21] #9 0.398 fetch https://mirrors.tencentyun.com/alpine/v3.20/main/x86_64/APKINDEX.tar.gz
[2025-02-14 11:27:21] #9 0.700 fetch https://mirrors.tencentyun.com/alpine/v3.20/community/x86_64/APKINDEX.tar.gz
[2025-02-14 11:27:22] #9 1.334 (1/32) Upgrading musl (1.2.5-r0 -> 1.2.5-r1)
[2025-02-14 11:27:22] #9 1.678 (2/32) Installing m4 (1.4.19-r3)
[2025-02-14 11:27:22] #9 1.863 (3/32) Installing libbz2 (1.0.8-r6)
[2025-02-14 11:27:22] #9 1.948 (4/32) Installing perl (5.38.3-r0)
[2025-02-14 11:27:24] #9 3.281 (5/32) Installing autoconf (2.72-r0)
[2025-02-14 11:27:24] #9 3.559 (6/32) Installing libmd (1.1.0-r0)
[2025-02-14 11:27:24] #9 3.642 (7/32) Installing dpkg (1.22.6-r1)
[2025-02-14 11:27:24] #9 4.025 (8/32) Installing pkgconf (2.2.0-r0)
[2025-02-14 11:27:24] #9 4.129 (9/32) Installing dpkg-dev (1.22.6-r1)