fix commit/push

Author: jensens

.github/workflows/release.yaml

@@ -41,5 +41,8 @@ jobs:
       - name: Postrelease
         run: >-
           make ZEST_RELEASER_POSTRELEASE_OPTIONS=--no-input postrelease
-          git commit pyproject.toml CHANGES.md -m"Post release: back to development."
+          git config --global user.name "${{ env.CI_COMMIT_AUTHOR }}"
+          git config --global user.email "username@users.noreply.github.com"
+          git add pyproject.toml CHANGES.md
+          git commit -m"Post release: back to development."
           git push