Adding upstream version 3.1.0+dfsg.

Signed-off-by: Daniel Baumann <daniel@debian.org>

.github/workflows/codeql.yml

@@ -0,0 +1,39 @@
+name: "CodeQL"
+
+on:
+  push:
+    branches: [ "master", "devel" ]
+  pull_request:
+    branches: [ "devel" ]
+
+jobs:
+  analyze:
+    name: Analyze
+    runs-on: ubuntu-latest
+    permissions:
+      actions: read
+      contents: read
+      security-events: write
+
+    strategy:
+      fail-fast: false
+      matrix:
+        language: [ cpp ]
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@main
+
+      - name: Initialize CodeQL
+        uses: github/codeql-action/init@main
+        with:
+          languages: ${{ matrix.language }}
+          queries: +security-and-quality
+
+      - name: Autobuild
+        uses: github/codeql-action/autobuild@main
+
+      - name: Perform CodeQL Analysis
+        uses: github/codeql-action/analyze@main
+        with:
+          category: "/language:${{ matrix.language }}"