ci: fix package pattern in helm chart release workflow

This was pointed out in https://github.com/kubernetes-sigs/headlamp/pull/3024/files#r2318193831

Signed-off-by: Devin Buhl <onedr0p@users.noreply.github.com>

Author: onedr0p

.github/workflows/helm-chart-release.yml

@@ -79,10 +79,9 @@ jobs:
 
       - name: Push Charts to GHCR
         run: |
-          for pkg in .cr-release-packages/*; do
+          for pkg in .cr-release-packages/*.tgz; do
             if [ -z "${pkg:-}" ]; then
               break
             fi
-
             helm push "${pkg}" oci://ghcr.io/${{ github.repository }}/charts
           done