fix(ci/chart): disable helm pluging verification

Author: vflaux

.github/workflows/lint-test-chart.yaml

@@ -38,8 +38,8 @@ jobs:
         run: |
           set -euo pipefail
 
-          helm plugin install https://github.com/losisin/helm-values-schema-json.git
-          helm plugin install https://github.com/helm-unittest/helm-unittest.git
+          helm plugin --verify=false install https://github.com/losisin/helm-values-schema-json.git
+          helm plugin --verify=false install https://github.com/helm-unittest/helm-unittest.git
 
       - name: Run Helm Schema check
         working-directory: charts/external-dns