Podman Desktop is adding a new additionalConfigHandlers API to RegistrySuggestedProvider that allows extensions to contribute named configuration handlers alongside the built-in username/password form. This extension should adopt the new API to offer "Red Hat SSO" as a configuration method for registry.redhat.io.

Upstream tracking issue: podman-desktop/podman-desktop#18133

What needs to change

Update the extensionApi.registry.suggestRegistry() call in src/extension.ts to include an additionalConfigHandlers array:

extensionApi.registry.suggestRegistry({
  name: 'Red Hat Container Registry',
  icon,
  url: 'registry.redhat.io',
  additionalConfigHandlers: [
    {
      label: 'Red Hat SSO',
      isDefault: true,
      handler: ssoConfigHandler,
    },
  ],
});

Behavior

• The Registries settings page will show a SplitButton for registry.redhat.io instead of the regular "Configure" button
• The SplitButton offers two options:
  • Configure — opens the existing username/password inline form
  • Configure with Red Hat SSO — invokes configureRegistryAndActivateSubscription (the SSO flow)
• Since isDefault: true is set, "Configure with Red Hat SSO" is pre-selected when the page opens

Dependencies

• Requires Podman Desktop version with the additionalConfigHandlers API (tracked in Suggested Registry API should support additional configuration handlers podman-desktop/podman-desktop#18133)
• The @podman-desktop/api package must be updated to a version that includes the RegistrySuggestedProviderConfigHandler interface

Acceptance Criteria

• suggestRegistry() call updated with additionalConfigHandlers
• Red Hat SSO handler marked as isDefault: true
• Handler invokes the existing ssoConfigHandler function
• 'ssoConfigHandler' function should send telemetry to identify usage of RedHat SSO from Registries page
• Minimum @podman-desktop/api version bumped to the release containing the new API
• Unit tests updated to cover the new parameter
• Extension works correctly with both the new API (SplitButton) and falls back gracefully if loaded in an older Podman Desktop version