feat(ci): add Checkov security scanning workflow

.github/workflows/security-checkov.yaml

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+# SPDX-FileCopyrightText: Copyright (c) 2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+# SPDX-License-Identifier: Apache-2.0
+#
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+name: Checkov Security Scan
+
+on:
+  pull_request:
+    branches: [main]
+    paths:
+      - 'chart/**'
+  push:
+    branches: [main]
+    paths:
+      - 'chart/**'
+
+jobs:
+  checkov:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Run Checkov
+        uses: bridgecrewio/checkov-action@master
+        with:
+          directory: chart
+          framework: helm
+          output_format: cli