我在代理后面，我已经为 Docker 设置了代理配置并能够下载 docker 图像，但我无法从我的 docker 文件构建，因为它在获取http://dl-cdn.alpinelinux.org/alpine/v3 时总是失败.8/main/x86_64/APKINDEX.tar.gz
我尝试了其他方法，例如更改 repo，但仍然无法构建
FROM python:3.6-alpine
ENV PYTHONUNBUFFERED 1
#RUN sed -i 's/http\:\/\/dl-cdn.alpinelinux.org/https\:\/\/alpine.global.ssl.fastly.net/g' /etc/apk/repositories
RUN apk update \
# psycopg2 dependencies
&& apk add --virtual build-deps gcc python3-dev musl-dev \
&& apk add postgresql-dev \
# Pillow dependencies
&& apk add jpeg-dev zlib-dev freetype-dev lcms2-dev openjpeg-dev tiff-dev tk-dev tcl-dev \
# CFFI dependencies
&& apk add libffi-dev py-cffi \
# Translations dependencies
&& apk add gettext \
# https://docs.djangoproject.com/en/dev/ref/django-admin/#dbshell
&& apk …