chore: fix gitpage.yml

Author: ksw2000

.github/workflows/gitpage.yml

@@ -28,9 +28,9 @@ jobs:
       - name: generate example page by web js
         run: |
           mkdir output/js
-          cp ./dist/web/hmd2html.min.js ./output/js
-          cp ./example/index.md ./output/index.md
-          cp ./example/index.html ./output/webjs.html
+          mv ./dist/web/hmd2html.min.js ./output/js
+          mv ./example/index.md ./output/index.md
+          mv ./example/index.html ./output/webjs.html
 
       - name: Check for changes
         id: check_changes
@@ -41,10 +41,10 @@ jobs:
           git config user.email "nodejs-ci@github.com"
           git remote add secure-origin https://${{ secrets.NPM_CI }}@github.com/ksw2000/${{ github.event.repository.name }}
           git checkout -b gh-pages
-          git diff --exit-code || echo "Changes detected"
+          git diff --exit-code || echo "::set-output name=changes_detected::true"
 
       - name: commit and push
-        if: steps.check_changes.outputs.exit-code != 0
+        if: steps.check_changes.outputs.changes_detected == 'true'
         run: |
           git add .
           git commit -m "Generated by CI"