Hi,
I was trying this out to see how well it would work, running the latest syspass available on docker hub (3.2.11), but it fails due to php being too old:
[Wed Sep 28 04:18:26.470977 2022] [php7:error] [pid 905] [client ] PHP Fatal error: Composer detected issues in your platform: Your Composer dependencies require a PHP version ">= 7.4.0". You are running 7.3.31-1~deb10u1. in /var/www/html/sysPass/vendor/composer/platform_check.php on line 24
Being the type of person I am, I disabled the check and everything works fine, but out of the box it doesn't seem to work currently.