Add nebula-preview

Signed-off-by: Tim Hansen <timbonicus@gmail.com>

plugins/scaffolder-backend/src/scaffolder/actions/builtin/publish/github.ts

@@ -149,6 +149,7 @@ export function createPublishGithubAction(options: {
       const client = new Octokit({
         auth: token,
         baseUrl: integrationConfig.config.apiBaseUrl,
+        previews: ['nebula-preview'],
       });
 
       const user = await client.users.getByUsername({

plugins/scaffolder-backend/src/scaffolder/stages/publish/github.ts

@@ -72,6 +72,7 @@ export class GithubPublisher implements PublisherBase {
     const client = new Octokit({
       auth: token,
       baseUrl: this.config.apiBaseUrl,
+      previews: ['nebula-preview'],
     });
 
     const description = values.description as string;