Add support for the newer Ubuntu.

- update PHP to version 7
    - update supervisor config accordingly
    - update nginx config accordingly

Dockerfile

@@ -2,11 +2,13 @@ FROM ubuntu
 MAINTAINER Christian Lück <christian@lueck.tv>
 
 RUN DEBIAN_FRONTEND=noninteractive apt-get update && apt-get install -y \
-  nginx supervisor php5-fpm php5-cli php5-curl php5-gd php5-json \
-  php5-pgsql php5-mysql php5-mcrypt && apt-get clean && rm -rf /var/lib/apt/lists/*
+  nginx supervisor php-fpm php-cli php-curl php-gd php-json \
+  php-pgsql php-mysql php-mcrypt php-mbstring php-xml && apt-get clean && rm -rf /var/lib/apt/lists/* && \
+  phpenmod mcrypt && mkdir /run/php
 
 # enable the mcrypt module
-RUN php5enmod mcrypt
+RUN phpenmod mcrypt
+
 
 # add ttrss as the only nginx site
 ADD ttrss.nginx.conf /etc/nginx/sites-available/ttrss