squash! setup.cfg: combine coverage results

github-actions: run `rapidjson` testenv separately

To append coverage results.

.github/workflows/tox.yml

@@ -31,7 +31,8 @@ jobs:
     - name: Test with tox
       run: |
         pyenv="py$(echo "${{ matrix.python-version }}" | tr -d '.')"
-        tox -e ${pyenv}-test,${pyenv}-rapidjson,flake8,lint
+        tox -e ${pyenv}-test,flake8,lint
+        tox -e ${pyenv}-rapidjson -- --cov-append
     - name: Check code format with black
       if: matrix.python-version == 3.9
       run: tox -e black

setup.cfg

@@ -1,7 +1,7 @@
 [tool:pytest]
 addopts = -v --junit-xml=test-report.xml
           --doctest-modules
-          --cov=riotctrl --cov-branch --cov-append
+          --cov=riotctrl --cov-branch
           --cov-report=term-missing --cov-report=xml
 testpaths = riotctrl
 markers =