Add flawfinder workflow

code-scanning/flawfinder.yml

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+# This workflow uses actions that are not certified by GitHub.
+# They are provided by a third-party and are governed by
+# separate terms of service, privacy policy, and support
+# documentation.
+
+name: flawfinder
+
+on:
+  push:
+    branches: [ $default-branch, $protected-branches ]
+  pull_request:
+    # The branches below must be a subset of the branches above
+    branches: [ $default-branch ]
+  schedule:
+    - cron: $cron-weekly
+
+jobs:
+  flawfinder:
+    name: Flawfinder
+    runs-on: ubuntu-latest
+    permissions:
+      actions: read
+      contents: read
+      security-events: write
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - name: Run Flawfinder
+        uses: david-a-wheeler/flawfinder@v1.0
+        with:
+          arguments: '--sarif ./'
+          output: 'flawfinder_results.sarif'
+
+      - name: Upload analysis results to GitHub Security tab
+        uses: github/codeql-action/upload-sarif@v1
+        with:
+          sarif_file: flawfinder_results.sarif

code-scanning/properties/flawfinder.properties.json

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+{
+    "name": "Flawfinder",
+    "creator": "David A. Wheeler",
+    "description": "Flawfinder is a simple program that scans C/C++ source code and reports potential security flaws.",
+    "iconName": "flawfinder",
+    "categories": [ "Code Scanning", "C", "C++" ]
+}