Docker setup for running unit tests on PHP 5.6

.gitattributes

@@ -1,3 +1,5 @@
 /examples export-ignore
+/docs export-ignore
+/export export-ignore
 /tests export-ignore
 /.* export-ignore

.gitignore

@@ -10,3 +10,5 @@ nbproject/
 /coverage
 /phpunit.phar
 composer.lock
+composer.phar
+.phpunit.result.cache

composer.json

@@ -14,10 +14,10 @@
         }
     ],
     "require": {
-        "php": ">=5.0.0"
+        "php": "5.6.*"
     },
     "require-dev": {
-        "phpunit/phpunit": "~4.8.35||~5.7"
+        "phpunit/phpunit": "~4.8.36"
     },
     "autoload": {
         "classmap": ["Mobile_Detect.php"],

docker-compose.yml

@@ -1,16 +1,15 @@
-app:
-  restart: 'on-failure'
-  image: php:7
-  working_dir: /app
-  command: vendor/bin/phpunit -v -c tests/phpunit.xml --coverage-text --strict-coverage --stop-on-risky
-  ports:
-    - "8000:8000"
-  volumes:
-    - .:/app
-
-composer:
-  restart: 'no'
-  image: composer/composer:php7
-  command: install
-  volumes:
-    - .:/app
+services:
+  app:
+    image: php:5.6-cli-alpine3.8
+    working_dir: /app
+    command: >
+      /bin/sh -c "
+      rm -rf vendor && 
+      rm -f composer.lock composer.phar &&
+      curl -s https://getcomposer.org/download/2.0.0/composer.phar -o composer.phar &&
+      php composer.phar update --no-interaction --prefer-dist -vvv &&
+      vendor/bin/phpunit -v -c tests/phpunit.xml --coverage-text --strict-coverage --stop-on-risky"
+    ports:
+      - "8000:8000"
+    volumes:
+      - .:/app