Only release Helm charts on tags (#2281)

Signed-off-by: Trey Dockendorf <tdockendorf@osc.edu>

.github/workflows/helm-release.yaml

@@ -1,12 +1,8 @@
 name: helm-release
 on:
   push:
-    branches:
+    tags:
-      - 'main'
+      - 'helm-chart-v*'
-    paths:
-      - 'charts/kyverno-crds/Chart.yaml'
-      - 'charts/kyverno/Chart.yaml'
-      - '.github/workflows/helm-release.yaml'
 
 jobs:
   helm-tests: