feat: add OpenSSF Scorecard workflow

.github/workflows/scorecard.yml

@@ -0,0 +1,36 @@
+name: OpenSSF Scorecard
+
+on:
+  schedule:
+    - cron: '0 6 * * 1' # Every Monday at 6:00 UTC
+  push:
+    branches:
+      - main
+  workflow_dispatch:
+
+permissions: read-all
+
+jobs:
+  analysis:
+    name: Scorecard Analysis
+    runs-on: ubuntu-latest
+    permissions:
+      security-events: write
+      id-token: write
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          persist-credentials: false
+
+      - name: Run OpenSSF Scorecard
+        uses: ossf/scorecard-action@v2.4.1
+        with:
+          results_file: results.sarif
+          results_format: sarif
+          publish_results: true
+
+      - name: Upload to GitHub Security tab
+        uses: github/codeql-action/upload-sarif@v3
+        with:
+          sarif_file: results.sarif