Update kanboard dockerfile

pica-kanboard/Dockerfile

 FROM registry.picasoft.net:5000/pica-nginx
 MAINTAINER antoine@barbare.me
 
-RUN apt-get update -y && apt-get install -y php7.0-mbstring php7.0-sqlite3 unzip
+RUN export DEBIAN_FRONTEND=noninteractive && \
+    apt-get update -y && \
+    apt-get -o Dpkg::Options::="--force-confdef" -o Dpkg::Options::="--force-confold" \
+    	install -y \
+    	php7.0-mbstring \
+	php7.0-pgsql \
+    	unzip
 
 RUN cd /var/www && \
     curl -O -L "http://kanboard.net/kanboard-latest.zip" && \
@@ -12,6 +18,6 @@ RUN cd /var/www && \
     chown -R www-data:www-data /var/www/html
 
 EXPOSE 80
-VOLUME ["/var/www","/var/www/html/data"]
+VOLUME ["/var/www/html/data","/var/www/html/plugins"]
 
 CMD /start.sh