fix(actions): skip longhorn application as it requires direct kernel access

.forgejo/workflows/validate.yaml

@@ -48,7 +48,13 @@ jobs:
           kubectl rollout status deployment/sealed-secrets-controller -n kube-system --timeout=60s
 
       - name: Apply ArgoCD apps
-        run: kubectl apply -f apps/
+        run: |
+          for f in apps/*.yaml; do
+            case "$f" in
+              apps/longhorm.yaml) echo "Skipping $f" ;;
+              *) kubectl apply -f "$f" ;;
+            esac
+          done
 
       - name: Wait for ArgoCD sync
         run: |