Use coverage directly instead of dwas for reporting coverage

We will want to compiel coverage from multiple OSs, which we do not
handle normally otherwise. As such, let's just use coverage, it's going
to be faster too

.github/workflows/ci.yml

@@ -156,16 +156,18 @@ jobs:
           python-version: ${{ env.DEFAULT_PYTHON }}
           cache: pip
 
-      # FIXME: we should take dwas from pypi once it's published
-      - name: Install dwas
-        run: python -m pip install .
+      - name: Install coverage
+        run: python -m pip install coverage
 
       - name: Download generated coverage files
         uses: actions/download-artifact@v4
         with:
           merge-multiple: true
           pattern: coverage-*
-          path: .dwas/cache
+          path: reports/
+
+      - name: debug
+        run: find reports
 
       - name: Generate coverage report
         run: dwas --verbose --only coverage