Revert ":green_heart: Fix CI: push with valid signatures (#52)"

This reverts commit 8b3a3ad.

.github/workflows/build.yml

@@ -36,7 +36,7 @@ jobs:
           git config --global user.email '[email protected]'
           git remote set-url origin https://${GITHUB_USER}:${GITHUB_TOKEN}@github.com/$GITHUB_REPOSITORY
           git add .
-          git commit -S -m "Update [vald sha: ${sha}]"
+          git commit -m "Update [vald sha: ${sha}]"
           git push
         env:
           GITHUB_USER: ${{ secrets.CI_USER }}