update php build to include basic php7.3

updated robo build

dockerfiles/tasks/php/Dockerfile-7.0

@@ -0,0 +1,23 @@
+# Create a base Ubuntu image to build upon
+# docker build --rm -t xaicorp/php:7.0 .
+FROM ubuntu:16.04
+MAINTAINER Richard Morgan <r_morgan@sympatico.ca>
+
+WORKDIR /opt/project
+
+EXPOSE 9000
+
+# set terminal variable so that tools such as nano and htop work
+# this is not needed in prod containers, but is useful for devs
+ENV TERM=xterm
+
+RUN apt-get update && apt-get install -y \
+    curl nano sed libwww-perl htop ca-certificates \
+    php7.0 php-cli php-fpm php-curl php-pear php-mcrypt php-zip php-mbstring php-xml \
+    php-pgsql php-redis php-soap \
+    \
+  && apt-get clean && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
+
+COPY ./docker-php-fpm.conf /etc/php/7.0/fpm/pool.d/www.conf
+
+CMD ["/usr/sbin/php-fpm7.0", "-F"]