Refactor commit logic in update-readme.yml

Author: anton-staroverov

.github/workflows/update-readme.yml

@@ -24,5 +24,8 @@ jobs:
         run: |
           git config user.name "github-actions[bot]"
           git config user.email "github-actions[bot]@users.noreply.github.com"
-          git add README.md
-          git diff --quiet && git diff --staged --quiet || (git commit -m "docs: update README with config file contents" && git push)
+          if ! git diff --quiet HEAD; then
+            git add README.md
+            git commit -m "docs: update README with config file contents"
+            git push
+          fi