ci: update ci script to ignore commit failed in nothing to commit

.github/workflows/update_version.yaml

@@ -38,9 +38,7 @@ jobs:
           regex='s/v[0-9]*\.[0-9]*\.[0-9]*/v${{ steps.vars.outputs.tag }}/g'
           sed $regex README.md > a ; mv a README.md
           sed $regex site/content/_index.md > a ; mv a site/content/_index.md
-          git commit -a -m "update version to ${{ steps.vars.outputs.tag }}, ready to publish v${{ steps.vars.outputs.tag }}"
-          
-          true
+          git commit -a -m "update version to ${{ steps.vars.outputs.tag }}, ready to publish v${{ steps.vars.outputs.tag }}" || true
 
       - name: Push branch
         uses: ad-m/github-push-action@master