#315 fixed docker compose error and switched to PHP 7.2.0

Dockerfile

@@ -0,0 +1,7 @@
+FROM php:7.2.0-cli
+WORKDIR /opt/php
+RUN apt-get update \
+    && apt-get install -y zlib1g-dev wget git-core \
+    && docker-php-ext-install zip
+ADD . /opt/php
+CMD [ "./docker/test_runner.sh" ]

docker-compose.yml

@@ -1,9 +1,9 @@
 version: "3.1"
-
 services:
   php:
-    image: php:7.1.7-cli
+    build: 
+      context: .
+      dockerfile: Dockerfile
     volumes:
       - .:/opt/php
-    privileged: true
-    command: ["/opt/php/docker/test_runner.sh"]
+    command: ["/opt/php/docker/test_runner.sh"]

docker/test_runner.sh

@@ -1,12 +1,19 @@
-#!/usr/bin/env bash
-
-cd /opt/php
+#!/bin/sh
 
 echo "Installing composer..."
+EXPECTED_SIGNATURE=$(wget -q -O - https://composer.github.io/installer.sig)
 php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');"
-php -r "if (hash_file('SHA384', 'composer-setup.php') === '669656bab3166a7aff8a7506b8cb2d1c292f042046c5a994c43155c0be6190fa0355160742ab2e1c88d40d5be660b410') { echo 'Installer verified'; } else { echo 'Installer corrupt'; unlink('composer-setup.php'); } echo PHP_EOL;"
-php composer-setup.php
-php -r "unlink('composer-setup.php');"
+ACTUAL_SIGNATURE=$(php -r "echo hash_file('SHA384', 'composer-setup.php');")
+
+if [ "$EXPECTED_SIGNATURE" != "$ACTUAL_SIGNATURE" ]
+then
+    >&2 echo 'ERROR: Invalid installer signature'
+    rm composer-setup.php
+    exit 1
+fi
+
+php composer-setup.php --quiet
+rm composer-setup.php
 
 echo "Downloading dependencies using composer..."
 php composer.phar install --prefer-dist --no-interaction