chart/ghaction: set the correct permission to have access to push a release (#8115)

Signed-off-by: Carlos Panato <ctadeu@gmail.com>

.github/workflows/helm.yaml

@@ -33,6 +33,10 @@ jobs:
   chart:
     name: Release Chart
     runs-on: ubuntu-latest
+
+    permissions:
+      contents: write # needed to write releases
+
     needs:
       - changes
     if: |