env: force figures

Author: sunnivin

.github/workflows/ci.yml

@@ -45,7 +45,6 @@ jobs:
           cp talk/slides.html index.html
           cp -r talk/figures figures
           git add index.html
-          git add -f talk/figures
           git add talk/slides.html
           git add -f figures
           git config user.name "github-actions[bot]"