Use latest alpine:3.9 and composer:1.8 that include newer PHP 7.2

Author: iyarych

build/Dockerfile-nginx

@@ -1,10 +1,10 @@
-FROM composer/composer:1.1 as composer
+FROM composer:1.8 as composer
 
 ARG version=dev-master
 ARG http_version=dev-master
 RUN mkdir /ppm && cd /ppm && composer require php-pm/php-pm:${version} && composer require php-pm/httpkernel-adapter:${http_version}
 
-FROM alpine:3.7
+FROM alpine:3.9
 
 ENV LC_ALL en_US.UTF-8
 ENV LANG en_US.UTF-8

build/Dockerfile-ppm

@@ -1,10 +1,10 @@
-FROM composer/composer:1.1 as composer
+FROM composer:1.8 as composer
 
 ARG version=dev-master
 ARG http_version=dev-master
 RUN mkdir /ppm && cd /ppm && composer require php-pm/php-pm:${version} && composer require php-pm/httpkernel-adapter:${http_version}
 
-FROM alpine:3.7
+FROM alpine:3.9
 
 ENV LC_ALL en_US.UTF-8
 ENV LANG en_US.UTF-8

build/Dockerfile-standalone

@@ -1,10 +1,10 @@
-FROM composer/composer:1.1 as composer
+FROM composer:1.8 as composer
 
 ARG version=dev-master
 ARG http_version=dev-master
 RUN mkdir /ppm && cd /ppm && composer require php-pm/php-pm:${version} && composer require php-pm/httpkernel-adapter:${http_version}
 
-FROM alpine:3.7
+FROM alpine:3.9
 
 ENV LC_ALL en_US.UTF-8
 ENV LANG en_US.UTF-8