Try and generate coverage report in actions

.github/workflows/unit-tests.yml

@@ -33,7 +33,7 @@ jobs:
         uses: actions/cache@v4
         with:
           path: ~/.conan2
-          key: ${{ runner.os }}-${{ hashFiles('**/conan.lock') }}
+          key: ${{ runner.os }}-${{ hashFiles('**/conan.lock') }}-Release
       - name: Install package dependencies
         run: poetry run conan install . --profile:all=./.conan2/profiles/${{ runner.os }} --output-folder=build --build=missing --lockfile-partial
       - name: Configure
@@ -51,3 +51,39 @@ jobs:
         run: ./bin/tests
         env:
           ESPEAK_DATA_PATH: ./vendor/src/espeak-ng/espeak-ng-data
+  coverage:
+    runs-on: ubuntu-latest
+    needs: main
+    env:
+      DISPLAY: ":99"
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.13"
+      - uses: abatilo/actions-poetry@v2
+      - name: Configure runner
+        run: sudo apt-get install clang ninja-build
+      - name: Install Conan
+        run: |
+          poetry install
+          poetry run conan version
+      - name: Restore Conan cache
+        uses: actions/cache@v4
+        with:
+          path: ~/.conan2
+          key: ${{ runner.os }}-${{ hashFiles('**/conan.lock') }}-Debug
+      - name: Install package dependencies
+        run: poetry run conan install . --profile:all=./.conan2/profiles/${{ runner.os }} --output-folder=build --build=missing --lockfile-partial --settings=build_type=Debug
+      - name: Configure
+        run: cmake .. -G Ninja -DCMAKE_TOOLCHAIN_FILE=conan_toolchain.cmake  -DCMAKE_POLICY_DEFAULT_CMP0091=NEW -DCMAKE_BUILD_TYPE=Debug -DGCOVR_XML=ON
+        working-directory: build
+      - name: Xvfb
+        run: |
+          Xvfb $DISPLAY -screen 0 1920x1080x24 -ac +extension GLX &
+          sleep 5
+          fluxbox > /dev/null 2>&1 &
+          sleep 5
+      - name: Build XML report
+        run: cmake --build . --config Debug -t coverage-xml
+        working-directory: build