mkcert Web UI 5.0.1

Fixed

• SSO stayed broken until restart if the OIDC provider was unreachable at
  startup (#59). Discovery ran once at boot; when it failed, /auth/oidc
  answered 500 Unknown authentication strategy "oidc" until the process was
  restarted (typical with Docker Compose starting mkcert-web before the
  identity provider). Discovery is now retried when someone signs in with
  SSO, at most once every 10 seconds, and until the provider answers the
  browser is returned to the login page with a "provider cannot be reached"
  message. The discovery request also has a 10 second timeout, so a provider
  that accepts connections but never answers no longer stalls startup.

Added

• docs/DOCKERHUB.md, the Docker Hub overview page. docker-build-push.sh
  now publishes it, with the short description, after each push, and
  --overview-only updates the page without building.

Images

• Docker Hub: jeffcaldwellca/mkcertweb:5.0.1 (also 5.0, 5, latest)
• GHCR: ghcr.io/jeffcaldwellca/mkcertweb:v5.0.1