change application source laradock#397 (laradock#609)

# fix a problem--laradock#397, change application source from dl-cdn.alpinelinux.org to aliyun source.

Author: mouyong

nginx/Dockerfile

@@ -6,6 +6,9 @@ ADD nginx.conf /etc/nginx/
 
 ARG PHP_UPSTREAM=php-fpm
 
+# fix a problem--#397, change application source from dl-cdn.alpinelinux.org to aliyun source.
+RUN sed -i 's/dl-cdn.alpinelinux.org/mirrors.aliyun.com/' /etc/apk/repositories
+
 RUN apk update \
     && apk upgrade \
     && apk add --no-cache bash \