chore: disable shellcheck SC2016 in entryscript

We do not want to replace variables.

Author: josecelano

share/container/entry_script_sh

@@ -73,6 +73,7 @@ if [ -e "/usr/share/torrust/container/message" ]; then
 fi
 
 # Load message of the day from Profile
+# shellcheck disable=SC2016
 echo '[ ! -z "$TERM" -a -r /etc/motd ] && cat /etc/motd' >> /etc/profile
 
 cd /home/torrust || exit 1