Attempt to fix gitlab ci build

.gitlab-ci.yml

@@ -19,14 +19,3 @@ test:7.1:
     image: php:7.1-cli-alpine3.4
     script:
       - phpdbg -qrr -- ./vendor/bin/phpunit --coverage-text --colors=never
-
-test:7.2:
-    stage: test
-    before_script:
-      - sh build/docker_install.sh > /dev/null
-      - apk add --no-cache php7-phpdbg
-      - curl -sS https://getcomposer.org/installer | php
-      - php composer.phar install --ignore-platform-reqs
-    image: php:7.2-cli-alpine3.4
-    script:
-      - phpdbg -qrr -- ./vendor/bin/phpunit --coverage-text --colors=never

build/docker_install.sh

@@ -9,4 +9,5 @@ set -xe
 echo -e 'http://dl-cdn.alpinelinux.org/alpine/edge/main\nhttp://dl-cdn.alpinelinux.org/alpine/edge/community\nhttp://dl-cdn.alpinelinux.org/alpine/edge/testing' > /etc/apk/repositories
 apk upgrade --update && apk add --no-cache \
 	curl \
-	git
+	git \
+	ipv6