Major new features

OIDC back-channel logout - #2740

Warpgate now accepts OpenID Connect Back-Channel Logout requests at /@warpgate/api/sso/providers/<name>/backchannel-logout. When the identity provider signs a user out, it ends their Warpgate sessions on every cluster node. The new disable_local_logout provider option hides Warpgate's own "log out" button when the provider supports single logout.

Full Changelog: v0.30.0-beta.2...v0.30.0-beta.3