Do the coverage thing

Author: yoe

.github/workflows/build.yml

@@ -10,4 +10,17 @@ jobs:
         uses: actions/checkout@v4
       - run: ./autogen.sh
       - run: ./configure --enable-syslog
-      - run: make distcheck
+      - name: Build and run tests (coverage)
+        run: |
+          make CFLAGS="--coverage -O0 -g" CXXFLAGS="--coverage -O0 -g" LDFLAGS="--coverage"
+          make check CFLAGS="--coverage -O0 -g" CXXFLAGS="--coverage -O0 -g" LDFLAGS="--coverage"
+      - name: Generate coverage reports
+        run: |
+          gcovr -r . --exclude-directories tests --print-summary --xml-pretty -o coverage.xml --html=coverage.html --html-details
+      - name: Upload coverage reports
+        uses: actions/upload-artifact@v4
+        with:
+          name: coverage
+          path: |
+            coverage.xml
+            coverage.html