Add Docker files and documentation

Dockerfile

@@ -0,0 +1,12 @@
+FROM php:7.2-cli
+
+RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y \
+    libzip-dev \
+    locales \
+    locales-all \
+    zip \
+  && docker-php-ext-configure zip --with-libzip \
+  && docker-php-ext-install zip
+
+COPY --from=composer:2 /usr/bin/composer /usr/local/bin/composer
+RUN chmod +x /usr/local/bin/composer

README.md

@@ -40,6 +40,19 @@ For information, the performance tests take about 10 minutes to run (processing
 
 > Performance tests status: [![Build Status](https://travis-ci.org/box/spout.svg?branch=perf-tests)](https://travis-ci.org/box/spout)
 
+### Running test with Docker
+
+First install the dependencies with docker-compose
+
+```bash
+docker-compose run --rm -u ${UID} php composer install
+```
+
+Then launch the tests
+
+```bash
+docker-compose run --rm php vendor/bin/phpunit
+```
 
 ## Support
 

docker-compose.yml

@@ -0,0 +1,8 @@
+version: '3'
+services:
+  php:
+    build: .
+    working_dir: /srv/spout
+    volumes:
+      - $PWD:/srv/spout
+      - $PWD/tests/generated/resources/unwritable:/srv/spout/tests/resources/generated/unwritable:ro