ci: Use new codecov uploader (#2541)

* ci: Use new codecov uploader

The bash uploader is deprecated

Ref: https://about.codecov.io/blog/codecov-uploader-deprecation-plan/

* Collect coverage report using lcov

* Remove branch coverage

There are a lot of hidden branches in the C++ code which doesn't make it
very useful

.github/workflows/ci.yml

@@ -95,6 +95,10 @@ jobs:
               libnl-genl-3-dev \
               libmpdclient-dev
           fi
+
+          if [ "$POLYBAR_BUILD_TYPE" = "tests" ]; then
+            sudo apt-get install -y lcov
+          fi
       - uses: actions/checkout@v2
         with:
           submodules: true
@@ -107,13 +111,28 @@ jobs:
         run: |
           cd $BUILD_DIR
           make
+      - name: Collect initial coverage
+        if: ${{ matrix.polybar_build_type == 'tests' }}
+        run: |
+          lcov --capture --initial --no-external --directory . -o cov_base.info
       - name: Tests
         if: ${{ matrix.polybar_build_type == 'tests' }}
         run: |
           cd $BUILD_DIR
           make check
-          cd $POLYBAR_DIR
+      - name: Collect coverage
-          bash <(curl -s https://codecov.io/bash) -F unittests -a "-ap" -Z
+        if: ${{ matrix.polybar_build_type == 'tests' }}
+        run: |
+          lcov --capture --no-external --directory . -o cov_tests.info
+          lcov --add-tracefile cov_base.info --add-tracefile cov_tests.info -o cov_total.info
+          lcov --remove cov_total.info ${PWD}'/build/*' ${PWD}'/tests/*' ${PWD}'/lib/*' -o cov.info
+      - name: Upload Coverage
+        if: ${{ matrix.polybar_build_type == 'tests' }}
+        uses: codecov/codecov-action@v2
+        with:
+          flags: unittests
+          files: ./cov.info
+          fail_ci_if_error: true
       - name: Upload Logs
         if: failure()
         uses: actions/upload-artifact@v2