Fix checkout in helm-publish workflow

Signed-off-by: Renan Magagnin <renanmag@amazon.co.uk>

Author: renanmagagnin

.github/workflows/helm-publish.yaml

@@ -25,6 +25,7 @@ jobs:
         uses: actions/checkout@v6
         with:
           ref: main
+          path: main-branch
           sparse-checkout: |
             scripts/verify-helm-images.sh
           sparse-checkout-cone-mode: false
@@ -41,7 +42,7 @@ jobs:
           sudo chmod +x /usr/local/bin/crane
           crane version
       - name: Verify all images exist before publishing
-        run: ./scripts/verify-helm-images.sh
+        run: ./main-branch/scripts/verify-helm-images.sh
       # TODO: Uncomment after verifying the workflow works correctly
       # - name: Run chart-releaser
       #   uses: helm/chart-releaser-action@v1.7.0