= Support for loading authentication providers from dynamic plugins This update introduces support for loading authentication providers or modules from dynamic plugins, enabling greater flexibility and customization. Key improvements: Environment variable control: A new ENABLE_AUTH_PROVIDER_MODULE_OVERRIDE environment variable determines whether the backend installs the default authentication provider module. When enabled, dynamic plugins can be used to supply custom authentication providers. Custom sign-in page support: A new signInPage configuration allows frontend dynamic plugins to provide a custom SignInPage component. ```yaml dynamicPlugins:   frontend:     my-plugin-package:       signInPage: importName: CustomSignInPage ``` The exported CustomSignInPage will be mapped to components.SignInPage during frontend initialization. Authentication provider settings in the user settings page: A new providerSettings configuration field allows frontend dynamic plugins to define authentication provider settings for display in the Authentication Providers tab on the user settings page. ```yaml dynamicPlugins:   frontend:     my-plugin-package:       providerSettings: - title: Github Two description: Sign in with GitHub Org Two provider: core.auth.github-two ``` Each providerSettings entry creates a corresponding row in the Authentication Providers tab. The provider field should match the string used in createApiRef when defining the API reference: ```javascript export const ghTwoAuthApiRef: ApiRef<   OAuthApi & ProfileInfoApi & BackstageIdentityApi & SessionApi > = createApiRef({   id: 'core.auth.github-two', // <--- this string }) ``` This enhancement improves authentication flexibility, allowing dynamic plugins to provide custom authentication solutions and configurations for user settings.