refactor: replace custom CRM with Monica fork

scripts/docker/install-composer.sh

@@ -0,0 +1,23 @@
+#!/bin/sh
+
+set -v
+
+SETUP=composer-setup.php
+cd /tmp
+
+EXPECTED_SIGNATURE=$(curl -sS https://composer.github.io/installer.sig)
+curl -sS -o $SETUP https://getcomposer.org/installer
+ACTUAL_SIGNATURE=$(openssl sha384 $SETUP | cut -d' ' -f2)
+
+if [ "$EXPECTED_SIGNATURE" != "$ACTUAL_SIGNATURE" ]
+then
+    >&2 echo 'ERROR: Invalid installer signature'
+    rm $SETUP
+    exit 1
+fi
+
+php $SETUP --quiet --install-dir=/usr/local/bin --filename=composer
+RESULT=$?
+rm $SETUP
+
+exit $RESULT