ci: run coverage reports

.forgejo/workflows/tests.yml

@@ -8,6 +8,13 @@ jobs:
       - run: apk add --no-cache git nodejs-current
       - uses: actions/checkout@v4
 
-      - run: pip install -U pytest beartype termcolor
+      - run: pip install -U pytest pytest-cov beartype termcolor
-      - run: pytest
+      - run: >
-        working-directory: compiler
+          pytest
+          --cov-report=term
+          --cov-report=html
+          --cov=compiler compiler/tests/
+      - uses: actions/upload-artifact@v3
+        with:
+          name: coverage-report
+          path: htmlcov/