feat: keep up with technical recommandations

misc/compose/hydra-sql/install-composer.sh

@@ -0,0 +1,19 @@
+#!/bin/bash
+
+set -eo pipefail
+
+EXPECTED_SIGNATURE="$(wget -q -O- https://composer.github.io/installer.sig)"
+wget -q -O composer-setup.php https://getcomposer.org/installer
+ACTUAL_SIGNATURE="$(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=bin
+RESULT=$?
+rm composer-setup.php
+exit $RESULT