New OAuth Provider: Sign-in with Singpass

[kangmingtay]

Feature request

• Sign-in with Singpass
• https://api.singpass.gov.sg/library/identiface/developers/backend-oauth2-jws

[J0]

@kangmingtay was on the supabase hangout with @thorwebdev and @awalias and I think we might want to hold off since the Gov might move to use SGID

[J0]

Hey all,

We plan on tracking all OAuth provider requests on #451 so we'll be closing this issue in favor of the thread instead. Please feel free to follow along there instead.

Thanks!