Add coveralls for Python code

.github/workflows/test.yaml

@@ -11,7 +11,7 @@ jobs:
       - name: Build Docker image
         run: docker build --pull --rm -f "appu/Dockerfile" -t appu appu/.
       - name: Run tests in Docker container
-        run: docker run --rm appu /bin/sh -c 'pip install -r dev-requirements.txt; python -m pytest'
+        run: docker run --rm appu /bin/sh -c 'pip install -r dev-requirements.txt; python -m pytest --cov profile.cov --cov-report; coveralls'
   test:
     runs-on: ubuntu-latest
     steps:

README.md

@@ -1,5 +1,7 @@
 # appu
 
+[![Coverage Status](https://coveralls.io/repos/github/EDyO/appu/badge.svg)](https://coveralls.io/github/EDyO/appu)
+
 **A**utomatic **P**odcast **PU**blisher, aka appu, is a toolkit for podcast edition and publishing.
 
 ## Rationale

appu/dev-requirements.txt

@@ -13,3 +13,5 @@ pytest==5.4.2
 six==1.14.0
 wcwidth==0.1.9
 zipp==3.1.0
+coverage==7.6.10
+python-coveralls==2.9.3