CI: add codecov step

The code coverage check is added to help keeping good quality
of the project and covered as much as possible with tests that
actually uses the majority of the routines.

.github/workflows/ci.yml

@@ -68,4 +68,13 @@ jobs:
         -   name: Run pytest
             env:
                 AIIDA_WARN_v3: 1
-            run: pytest -sv tests
+            run: pytest -sv tests --cov aiida-vibroscopy
+
+        -   name: Upload to Codecov
+            if: matrix.python-version == 3.10
+            uses: codecov/codecov-action@v3
+            with:
+                token: ${{ secrets.CODECOV_TOKEN }}
+                name: pytests-lammps
+                flags: pytests
+                fail_ci_if_error: true

codecov.yaml

@@ -0,0 +1,10 @@
+coverage:
+  status:
+    project:
+      default:
+        target: 75%
+        threshold: 0.2%
+    patch:
+      default:
+        target: 70%
+        threshold: 0.2%