ci: add sanitiser builds to detect memory errors

- Add AddressSanitizer for memory error detection
- Add ThreadSanitizer for race condition detection
- Add UndefinedBehaviorSanitizer for undefined behaviour
- Run on self-hosted runner with clang

Signed-off-by: NotKeira <github.rxs06@accounts.keira.boo>

Author: NotKeira

.github/workflows/ci.yaml

@@ -84,4 +84,30 @@ jobs:
       - name: Run Benchmarks (Release only)
         if: matrix.build_type == 'Release'
         working-directory: build
-        run: ./alloc_benchmarks --benchmark_min_time=0.1
+        run: ./alloc_benchmarks --benchmark_min_time=0.1
+  sanitisers:
+    runs-on: self-hosted
+    strategy:
+      matrix:
+        sanitiser: [ address, thread, undefined ]
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Configure with Sanitiser
+        env:
+          CC: clang
+          CXX: clang++
+        run: |
+          cmake -B build -DCMAKE_BUILD_TYPE=Debug \
+            -DCMAKE_CXX_FLAGS="-fsanitize=${{ matrix.sanitiser }} -fno-omit-frame-pointer -g" \
+            -DCMAKE_EXE_LINKER_FLAGS="-fsanitize=${{ matrix.sanitiser }}"
+
+      - name: Build
+        run: cmake --build build
+
+      - name: Run Tests
+        working-directory: build
+        env:
+          ASAN_OPTIONS: detect_leaks=1
+          TSAN_OPTIONS: second_deadlock_stack=1
+        run: ctest --output-on-failure