db install process

Dockerfile

@@ -23,6 +23,7 @@ EXPOSE 80 443
 
 COPY nginx.conf /etc/nginx/conf.d/default.conf
 COPY ttrss.conf /etc/php7/php-fpm.d/ttrss.conf
+COPY install-db.php /var/lib/tt-rss-install/install-db.php
 
 ADD https://git.tt-rss.org/fox/tt-rss/archive/18.12.tar.gz /tmp/ttrss.tar.gz
 RUN tar -xzf /tmp/ttrss.tar.gz -C /var/lib