Add Debian Salsa, GitLab, and others as authentication provider for jitsi meet moderator requirement

[programmerjake]

Is your feature request related to a problem you are facing?
Please describe the problem you are trying to solve.
Jitsi Meet requires authenticating with GitHub, Google, or Facebook in order to be a moderator which is required to start a meeting. Some people prefer to not use those services to authenticate and would like additional options. #13753

Describe the solution you'd like
Please describe the desired behavior.
Add more authentication providers to the list. I suggest:

• Debian Salsa
• GitLab
• Codeberg
• Stackexchange/Stackoverflow

As far as I can tell, these all support OAuth2

Describe alternatives you've considered
Please describe alternative solutions or features you have considered.
N/A

[saghul]

We are currently not considering any more providers. We might look into adding more in the future, however.