Reactivate coverage badge

.github/workflows/pytest.yml

@@ -25,3 +25,24 @@ jobs:
 
       - name: Run pytest
         run: pytest --cov=liesel --run-mcmc
+
+      - name: Create coverage badge
+        uses: tj-actions/coverage-badge-py@v2
+        with:
+          output: coverage-new.svg
+
+      - name: Commit coverage.svg
+        run: |
+          git config --local user.name "github-actions[bot]"
+          git config --local user.email "github-actions[bot]@users.noreply.github.com"
+          git ls-remote | grep refs/heads/pytest-cov && git remote set-branches --add origin pytest-cov && git fetch
+          git switch pytest-cov || git switch --orphan pytest-cov
+          mv coverage-new.svg coverage.svg
+          git add coverage.svg
+          git diff --staged --quiet || git commit -m "Updated coverage.svg"
+
+      - name: Push coverage.svg
+        uses: ad-m/github-push-action@master
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          branch: pytest-cov