Only release Helm Chart when version changed. (#7747)

**What this PR does / why we need it**:
The Helm Chart release often breaks when changes missed to update the
Helm Chart version. There is also often a conflict in the version.

This solution proposes to check the `Chart.yaml` for changes.

.github/workflows/helm-release.yaml

@@ -5,7 +5,7 @@ on:
     branches:
       - main
     paths:
-      - 'production/helm/**'
+      - 'production/helm/loki/Chart.yaml'
 
 jobs:
   call-update-helm-repo: