Hi,

The README install instructions says:

To get started put the version of simplesamlphp you want to test in a folder named simplesamlphp

I wasted a couple of hours doing echo v1.18.6 > version and a lot of variations on the simplesamlphp folder, until I realized that this meant to put the source code of SimpleSAMLphp on that folder.

Doing a git clone https://github.com/simplesamlphp/docker-simplesamlphp.git and then checking out the desired version did the trick.

I think it would be easier for noobs like me to put this steps explicitly on the README (git clone ..., etc). (or better, to make this docker to checkout a specific version via a environment var)

Per the instructions, I copied the simplesamlphp repo and ran docker-compose, but when I try to access the idp or sp, I get the following error...

$ docker logs docker-simplesamlphp_idp.tutorial.stack-dev.cirrusidentity.com_1
[Tue Oct 13 19:56:44 2020] 172.22.0.9:49084 [200]: / - Uncaught Exception: Unable to load Composer autoloader in /code/lib/_autoload.php:20
Stack trace:
#0 /code/www/_include.php(4): require_once()
#1 /code/www/index.php(3): require_once('/code/www/_incl...')
#2 {main}
  thrown in /code/lib/_autoload.php on line 20