More standard git user setup

Apparently lots of other people would also love this to be more automatic: actions/checkout#13

Author: jennybc

.github/workflows/R-CMD-check.yaml

@@ -57,11 +57,11 @@ jobs:
           extra-packages: any::rcmdcheck
           needs: check
 
-      - name: git config
+      - name: Configure Git User
         if: matrix.config.r == 'release'
         run: |
-          git config --global user.name "$GITHUB_ACTOR"
-          git config --global user.email "$GITHUB_ACTOR@users.noreply.github.com"
+          git config user.name github-actions[bot]
+          git config user.email 41898282+github-actions[bot]@users.noreply.github.com
 
       - uses: r-lib/actions/check-r-package@v2
         env: