i want to implement SSO login feature of discourse forum for my website, when i am enabling SSO it doesn’t allow me to put options for GitHub and google login so is there any way through which i can implement SSO with help of separate button , whenever user clicks button SSO login will be implemented
No, that’s not possible. If you use SSO then all other login options are disabled.
If you want to add an additional option alongside Google/GitHub, then I suggest you use OIDC or OAuth2, and use the Discourse plugins for those protocols.