chore(auth-node): allow declarative signin resolvers to take precedence

Signed-off-by: Frank Kong <frkong@redhat.com>

.changeset/neat-socks-cheer.md

@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-auth-node': patch
+---
+
+allow declarative sign in resolvers declared in `signInResolverFactories` to take precedence over the statically defined sign in resolvers in `signInResolver` for the `createOAuthProviderFactory`.

plugins/auth-node/src/oauth/createOAuthProviderFactory.ts

@@ -43,11 +43,10 @@ export function createOAuthProviderFactory<TProfile>(options: {
   return ctx => {
     return OAuthEnvironmentHandler.mapConfig(ctx.config, envConfig => {
       const signInResolver =
-        options.signInResolver ??
         readDeclarativeSignInResolver({
           config: envConfig,
           signInResolverFactories: options.signInResolverFactories ?? {},
-        });
+        }) ?? options.signInResolver;
 
       return createOAuthRouteHandlers<TProfile>({
         authenticator: options.authenticator,