fix: validate workflow

.github/workflows/validate-k8s.yml

@@ -36,17 +36,6 @@ jobs:
         with:
           version: 'v3.9.0'
 
-      - name: Install Helm Diff plugin
-        env:
-          HELM_PLUGINS: /home/runner/.local/share/helm/plugins
-        run: |
-          mkdir -p "$HELM_PLUGINS"
-          if ! helm plugin list | grep -q '^diff'; then
-            helm plugin install https://github.com/databus23/helm-diff
-          fi
-          helm plugin list
-          helm diff version
-
       - name: Determine DNS_HOST based on environment
         id: set_dns
         env:
@@ -82,6 +71,9 @@ jobs:
           sudo mv helmfile /usr/local/bin/
           helmfile --version
 
+      - name: Install Helm Diff plugin
+        run: helm plugin install https://github.com/databus23/helm-diff || true
+
       - name: Debug Helm env
         run: |
           helm env