ci: add weekly trivy security scan

.github/workflows/weekly-trivy.yml

@@ -0,0 +1,27 @@
+name: trivy
+on:
+  schedule:
+    - cron: '0 9 * * 1' # monday
+  workflow_dispatch:
+  pull_request:
+jobs:
+  build:
+    name: Build
+    runs-on: ubuntu-22.04
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+
+      - name: Run Trivy vulnerability scanner in repo mode
+        uses: aquasecurity/trivy-action@master
+        with:
+          scan-type: 'fs'
+          ignore-unfixed: true
+          format: 'sarif'
+          output: 'trivy-results.sarif'
+          severity: 'CRITICAL'
+
+      - name: Upload Trivy scan results to GitHub Security tab
+        uses: github/codeql-action/upload-sarif@v2
+        with:
+          sarif_file: 'trivy-results.sarif'