ADMIN_KEY envar expires and recreates matching keys on startup without preserving allow lists

If the ADMIN_KEY envar is set, the following code block in configure_misp will run on every container start and potentially expire then recreate matching keys without preserving any allowlist entries set for the admin key.

    if [ -n "$ADMIN_KEY" ]; then
        if [ "$DISABLE_PRINTING_PLAINTEXT_CREDENTIALS" == "true" ]; then
            echo "... setting admin key from environment variable"
        else
            echo "... setting admin key to '${ADMIN_KEY}'"
        fi
        CHANGE_CMD=(sudo -u www-data /var/www/MISP/app/Console/cake User change_authkey 1 "${ADMIN_KEY}")

This should be updated to check if the user 1 key is already set to ADMIN_KEY, and if so, take no action to prevent creating duplicate entries or removing IP allow lists.