Apply beta badge to all of builds' docs (#17120)

Author: GregBrimble

src/content/docs/workers/ci-cd/builds/index.mdx

@@ -3,8 +3,9 @@ pcx_content_type: concept
 title: Builds
 description: Use Workers Builds to integrate with Git and automatically build and deploy your Worker when you merge a pull request
 sidebar:
-  badge:
-    text: Beta
+  group:
+    badge:
+      text: Beta
 ---
 
 Workers Builds allows you to connect an existing Worker to a GitHub or GitLab repository to set up automatic builds and deployments for your development workflow. Creating a new Worker from a git repository will be supported soon.