Add image for galette

galette/Dockerfile

+FROM registry.picasoft.net:5000/pica-nginx
+
+MAINTAINER Kyâne kyane@kyane.fr
+
+# Install packages
+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-mysql \
+        php7.0-gd \
+        php7.0-curl \
+	php7.0-mbstring \
+        php7.0-tidy \
+        php-gettext