Add build arg in docker-compose.yml

.travis.yml

@@ -12,9 +12,8 @@ install:
   - docker version
   - sudo pip install docker-compose
   - docker-compose version
-  - sed -i -e "s/php:cli/php:${TRAVIS_PHP_VERSION}-cli/g" Dockerfile
   - cat Dockerfile
-  - docker-compose build
+  - docker-compose build --build-arg PHP_VERSION="${TRAVIS_PHP_VERSION}"
 
 script:
   - docker-compose up --exit-code-from php

docker-compose.yml

@@ -10,7 +10,7 @@ services:
             - .:/code
         working_dir: /code
         environment:
-          PHP_VERSION: ${TRAVIS_PHP_VERSION}
+          PHP_VERSION: ${PHP_VERSION}
         command: bash -c "composer install --prefer-source --no-interaction && php ./vendor/bin/phpunit"
         depends_on:
           - mysql