Revert "Revertme: remove cov step"

This reverts commit 3f1fe98.

Author: Lode Rosseel

.github/workflows/main.yml

@@ -65,6 +65,14 @@ jobs:
           sarif_file: zizmor.sarif
           category: zizmor
 
+      - name: Report coverage
+        if: contains(matrix.name, 'coverage')
+        uses: codecov/codecov-action@v5
+        with:
+          fail_ci_if_error: true
+          files: ./coverage.xml
+          token: ${{ secrets.CODECOV_TOKEN }}
+
     strategy:
       fail-fast: false
       matrix: