本地编译更改基础镜像为arm64v8/alpine:3.12，并使用国内镜像源

docker/Arm64v8/Dockerfile

@@ -1,12 +1,13 @@
-FROM arm64v8/alpine
+# FROM arm64v8/alpine
-#FROM arm64v8/alpine:latest
+# FROM arm64v8/alpine:latest
-#FROM arm64v8/alpine:3.12
+FROM arm64v8/alpine:3.12
 ENV TZ Asia/Shanghai
 ENV cron="0 9 * * 0"
 RUN set -ex \
-   # && sed -i 's/dl-cdn.alpinelinux.org/mirrors.ustc.edu.cn/' /etc/apk/repositories \
+    && sed -i 's/dl-cdn.alpinelinux.org/mirrors.ustc.edu.cn/' /etc/apk/repositories \
    # && sed -i 's/dl-cdn.alpinelinux.org/mirrors.aliyun.cn/' /etc/apk/repositories \
-    && apk --update add --no-cache \
+    && apk update \
+    && apk add --no-cache \
     tzdata \
     php7 php7-curl php7-json php7-mbstring php7-dom php7-simplexml php7-xml php7-zip \
     git \