mobile api changes + docker image basics

docker/service/cutler/apache2/install-composer

@@ -0,0 +1,17 @@
+#!/bin/sh
+
+EXPECTED_SIGNATURE=$(curl https://composer.github.io/installer.sig)
+php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');"
+ACTUAL_SIGNATURE=$(php -r "echo hash_file('SHA384', 'composer-setup.php');")
+
+if [ "$EXPECTED_SIGNATURE" != "$ACTUAL_SIGNATURE" ]
+then
+    >&2 echo 'ERROR: Invalid installer signature'
+    rm composer-setup.php
+    exit 1
+fi
+
+php composer-setup.php --install-dir=/usr/bin --filename=composer
+RESULT=$?
+rm composer-setup.php
+exit $RESULT