feat: add C/C++ coverage workflow

Author: sfxfs

.github/workflows/coverage.yml

@@ -0,0 +1,40 @@
+name: C/C++ Coverage
+
+on:
+  push:
+    branches: [ main, v* ]
+  pull_request:
+    branches: [ main, v* ]
+
+jobs:
+  build-and-test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+
+      - name: Install dependencies
+        run: sudo apt-get update && sudo apt-get install -y lcov gcc cmake make
+
+      - name: Configure CMake (with coverage flags)
+        run: |
+          cmake -B build -DCMAKE_BUILD_TYPE=Debug -DCMAKE_C_FLAGS="--coverage" -DCMAKE_EXE_LINKER_FLAGS="--coverage"
+
+      - name: Build
+        run: cmake --build build
+
+      - name: Run tests
+        run: |
+          cd build && ctest --output-on-failure
+
+      - name: Generate coverage report
+        run: |
+          lcov --capture --directory build --output-file coverage.info
+          lcov --remove coverage.info '*/Unity/*' '*/cJSON/*' --output-file coverage.info
+          lcov --list coverage.info
+
+      - name: Upload coverage artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: coverage-report
+          path: coverage.info