Add Slack to the list of supported OIDC providers

[sberyozkin]

Description

Slack offers a good OIDC integration and it is a popular platform

Implementation ideas

No response

[quarkus-bot]

/cc @pedroigor (oidc)

[patrox]

Hey @sberyozkin, if this task is free I would like to do it, as I'm also a Slack user.
I suppose the change would be similar to what you did in the past in the scope of: #37839 ?

[sberyozkin]

Hi @patrox Apologies for missing your comment. I've been thinking, it is time to look at this issue and noticed your comment.

Sure, if you are still interested, please go ahead. It should be similar to the LinkedIn I guess, since it looks like it provides a good OIDC support.

Thanks

[patrox]

No problem @sberyozkin, I've started to look at this issue and wrote some code to support this type of integration.

Now when I have your blessing, I'll try to wrap it up.

[sberyozkin]

Great, thanks @patrox

[sberyozkin]

Hey @patrox, are you still planning to go ahead with the PR ? I hope so :-)

[michalvavrik]

I am working on this. Docs is very nice but when granting rights to my Slack app then Slack app keeps redirecting me to legacy /oauth/v2/authorize so I'm not quite sure if I'll be able to finish this. I'll try tomorrow again.