Upgrade the Docker setup and dependencies

docker/app/install-composer.sh

@@ -0,0 +1,21 @@
+#!/bin/sh
+
+# Copyright (c) Nils Adermann, Jordi Boggiano
+# Origin: https://github.com/composer/composer/blob/master/doc/faqs/how-to-install-composer-programmatically.md
+# Licence: MIT
+
+EXPECTED_SIGNATURE=$(wget -q -O - https://composer.github.io/installer.sig)
+php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');"
+ACTUAL_SIGNATURE=$(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 --quiet
+RESULT=$?
+rm composer-setup.php
+exit $RESULT