add docker

Dockerfile

@@ -3,6 +3,11 @@ FROM php:7.3-apache
 # Update system
 RUN apt-get update
 
+# Install composer
+ENV COMPOSER_HOME "/home/www-data/.composer"
+RUN mkdir -p $COMPOSER_HOME && chmod -R 777 $COMPOSER_HOME && curl -sS https://getcomposer.org/installer | php \
+  && chmod +x composer.phar && mv composer.phar /usr/local/bin/composer
+
 RUN mkdir /srv/app
 COPY vhost.conf /etc/apache2/sites-available/000-default.conf