ci: Also build against an ASAN Qt

We now have Qt 6.11 builds built against ASAN/LSAN.

Added a minimal CMakePresets.json for the purpose of this task. Patches
accepted to add Window/macOS/static/ECM Sanitizers to it.

Author: iamsergio

.github/workflows/build-sanitizers.yml

@@ -0,0 +1,46 @@
+# SPDX-FileCopyrightText: 2026 Klarälvdalens Datakonsult AB, a KDAB Group company <info@kdab.com>
+#
+# SPDX-License-Identifier: MIT
+
+name: CI (Sanitizers)
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: true
+      matrix:
+        os:
+          - ubuntu-24.04
+        preset: ['dev-asan']
+        include:
+          - preset: dev-asan
+            qt-flavor: asan
+    steps:
+      - name: Checkout sources
+        uses: actions/checkout@v4
+
+      - name: Setup Sanitized Qt
+        uses: KDABLabs/sanitized-qt-action@v1
+        with:
+          qt-tag: "v6.11.0-beta2"
+          qt-flavor: ${{ matrix.qt-flavor }}
+
+      - name: Configure
+        run: cmake --preset=${{ matrix.preset }}
+
+      - name: Build
+        run: cmake --build ./build-${{ matrix.preset }}
+
+      - name: Run tests
+        run: |
+          ctest --test-dir ./build-${{ matrix.preset }} --output-on-failure

CMakePresets.json

@@ -0,0 +1,40 @@
+{
+  "version": 5,
+  "configurePresets": [
+    {
+      "name": "base",
+      "generator": "Ninja",
+      "binaryDir": "${sourceDir}/build-${presetName}",
+      "hidden": true,
+      "cacheVariables": {
+        "CMAKE_EXPORT_COMPILE_COMMANDS": "ON"
+      },
+      "warnings": {
+        "uninitialized": true
+      },
+      "errors": {
+        "dev": true
+      }
+    },
+    {
+      "name": "dev",
+      "inherits": ["base"],
+      "cacheVariables": {
+        "CMAKE_BUILD_TYPE": "Debug",
+        "KDSingleApplication_DOCS": "OFF",
+        "KDSingleApplication_EXAMPLES": "ON",
+        "KDSingleApplication_TESTS": "ON",
+        "KDSingleApplication_QT6": "ON"
+      }
+    },
+    {
+      "name": "dev-asan",
+      "inherits": ["dev"],
+      "cacheVariables": {
+        "CMAKE_CXX_FLAGS": "-DQT_FORCE_ASSERTS -fsanitize=address -fsanitize=undefined -fno-optimize-sibling-calls",
+        "CMAKE_SHARED_LINKER_FLAGS": "-fsanitize=address -fsanitize=undefined -fno-omit-frame-pointer",
+        "CMAKE_EXE_LINKER_FLAGS": "-fsanitize=address -fsanitize=undefined -fno-omit-frame-pointer"
+      }
+    }
+  ]
+}