update docker ci image

tests/ci_docker_install.sh

@@ -37,6 +37,9 @@ rm -r /var/lib/apt/lists/*
 #docker-php-ext-install xsl
 #pecl install apcu-5.1.21
 
+pecl install imagick
+docker-php-ext-enable imagick
+
 # Install XDebug (required for coverage)
 pecl install xdebug
 docker-php-ext-enable xdebug