Make check-whitespace.ymlcheck the final result only (#2158)

.github/workflows/check-whitespace.yml

@@ -17,33 +17,10 @@ jobs:
         with:
           fetch-depth: 0
 
-      - name: git log --check
-        id: check_out
-        run: |
-          log=
-          commit=
-          while read dash etc
-          do
-            case "${dash}" in
-            "---")
-              commit="${etc}"
-              ;;
-            "")
-              ;;
-            *)
-              if test -n "${commit}"
-              then
-                log="${log}\n${commit}"
-                echo ""
-                echo "--- ${commit}"
-              fi
-              commit=
-              log="${log}\n${dash} ${etc}"
-              echo "${dash} ${etc}"
-              ;;
-            esac
-          done <<< $(git log --check --pretty=format:"---% h% s" ${{github.event.pull_request.base.sha}}..)
-          if test -n "${log}"
-          then
-            exit 2
-          fi
+      - run: git checkout ${{github.event.pull_request.base.sha}}
+      - run: git merge --squash ${{github.event.pull_request.head.sha}}
+      - run: |
+          git config --global user.name "check-whitespace"
+          git config --global user.email "check-whitespace@example.com"
+      - run: git commit -m "Squashed"
+      - run: git log --check HEAD^..HEAD