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Issue description

failed to connect to GitLab server: 401: invalid_token
This issue is reproduceable, just create a completely new lab environment, login to desktop, ssh to workstation.lab.example.com and start command "lab start playbook-write"
It took me an half an hour to fix it, creating a new personal token on git.lab.example.com for user student and exchanged the token in file
/home/student/.venv/labs/libs/python3.9/site-packages/do417/ansible/inventory/host_vars/git/vars.yml
The fix helped not for the command "lab finish playbook-write". Other "lab start ..." commands did work after that fix.

Steps to reproduce:

Workaround: Run the following command every time you restart the lab environment

`lab install -u --env test --version 2.4.4.dev0+pr.768 do417` and then run the lab scripts

Expected result: