build(docker): add gd2

Author: zacksleo

7.1/jessie/fpm/mssql/Dockerfile

@@ -32,3 +32,11 @@ RUN apt-get install -y curl libmcrypt-dev openssh-client zlib1g-dev git \
     && echo "xdebug.remote_port=9000" >> /usr/local/etc/php/conf.d/docker-php-ext-xdebug.ini \
     && echo "xdebug.remote_handler=dbgp" >> /usr/local/etc/php/conf.d/docker-php-ext-xdebug.ini \
     && echo "xdebug.remote_connect_back=0" >> /usr/local/etc/php/conf.d/docker-php-ext-xdebug.ini
+
+# Install GD2
+RUN apt-get update && apt-get install -y \
+        libfreetype6-dev \
+        libjpeg62-turbo-dev \
+        libpng-dev \
+    && docker-php-ext-configure gd --with-freetype-dir=/usr/include/ --with-jpeg-dir=/usr/include/ \
+    && docker-php-ext-install gd