added global git user for commit in actiopn

Author: petesramek

.github/workflows/build.yml

@@ -240,6 +240,8 @@ jobs:
       - run: dotnet tool update -g docfx
       - run: docfx ./docfx/docfx.json
       - run: |
+          git config --global user.email "action@github.com"
+          git config --global user.name "GitHub Action"
           git add -- ./docs
           git commit -m'updated docs:${{ env.assembly-version }}' -- ./docs
       - name: Upload artifact