Update beta.yml

.github/workflows/beta.yml

@@ -39,6 +39,9 @@ jobs:
     name: Build and push Docker images
     runs-on: ubuntu-latest
     steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3