pref: add change source flag

laravel-horizon/Dockerfile

@@ -9,6 +9,14 @@ FROM php:${PHP_VERSION}-alpine
 
 LABEL maintainer="Mahmoud Zalt <mahmoud@zalt.me>"
 
+# If you're in China, or you need to change sources, will be set CHANGE_SOURCE to true in .env.
+
+ARG CHANGE_SOURCE=false
+RUN if [ ${CHANGE_SOURCE} = true ]; then \
+    # Change application source from dl-cdn.alpinelinux.org to aliyun source
+    sed -i 's/dl-cdn.alpinelinux.org/mirrors.aliyun.com/' /etc/apk/repositories \
+;fi
+
 RUN apk --update add wget \
   curl \
   git \
@@ -50,7 +58,7 @@ ARG INSTALL_CASSANDRA=false
 RUN if [ ${INSTALL_CASSANDRA} = true ]; then \
   apk --update add cassandra-cpp-driver \
   ;fi
-  
+
 # Install PhpRedis package:
 ARG INSTALL_PHPREDIS=false
 RUN if [ ${INSTALL_PHPREDIS} = true ]; then \