Merge pull request #82 from blar/alpine

Use alpine linux to reduce image size

Dockerfile

@@ -1,20 +1,12 @@
 ARG VERSION=7.3
-FROM php:${VERSION}-cli
 
-RUN set -xe \
-    && apt-get update \
-    && apt-get install -y git unzip \
-    && rm -rf /var/lib/apt/lists/* \
-    # Install composer
-    && php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');" \
-    && php composer-setup.php --install-dir /usr/local/bin --filename composer \
-    && php -r "unlink('composer-setup.php');" \
-    # Copy default php.ini
-    && cp /usr/local/etc/php/php.ini-development /usr/local/etc/php/php.ini \
-    && composer global require overtrue/phplint
+FROM composer:1.10 AS build
+RUN composer global require overtrue/phplint
 
+FROM php:${VERSION}-cli-alpine
+COPY --from=build /tmp/vendor /root/.composer/vendor
 COPY entrypoint.sh /entrypoint.sh
-
 RUN chmod +x /entrypoint.sh
+RUN cp /usr/local/etc/php/php.ini-development /usr/local/etc/php/php.ini
 
 ENTRYPOINT ["/entrypoint.sh"]