Use OpenIddict for identity

[DavidAJohn]

I'd like to update the Identity service project.

One option would be OpenIddict: https://documentation.openiddict.com/

[DavidAJohn]

Having looked at IdentityServer again recently I discovered that even the latest version (v7 for .NET 8) still uses Bootstrap 4 and jQuery in its .cshtml pages... in 2024!

I don't like the idea of that, but using Identity Server is still perhaps the least arduous - and most reliable - way to secure a containerized application. It would only involve customising the Login and Register pages after the initial setup.