Install in /app now, not /var/www/html

docker/Dockerfile

@@ -20,8 +20,7 @@ ENV SITE_USER=www-data
 COPY docker/init-docker /sbin/init-docker
 RUN chmod 550 /sbin/init-docker && chown ${SITE_USER}:0 /sbin/init-docker
 
-COPY . /var/www/html/
-WORKDIR /var/www/html
+COPY . /app
 
 RUN mkdir -p ${COMPOSER_HOME} \
 	&& ([ -r auth.json ] && mv auth.json ${COMPOSER_HOME}) || true \

docker/init-docker

@@ -3,7 +3,7 @@
 set -e
 role=${CONTAINER_ROLE:-app}
 env=${APP_ENV:-production}
-php=${PHP_DIR:-/var/www/html}
+php=${PHP_DIR:-/app}
 composer=${COMPOSER_HOME:-/var/cache/composer}
 
 RUN_USER=$(id -u -n)