Open pull request automatically when code are generated by openapi generator (#532)

github acitons doesn't support `push to change to protected branch`...
- https://github.com/orgs/community/discussions/25305
- https://github.com/orgs/community/discussions/13836
-
https://stackoverflow.com/questions/74128344/github-protected-branch-hook-declined-even-with-allow-force-pushes

Thus we need to approve pull request created by github actions.

Author: Yang-33

.github/workflows/commit-generated-code.yml renamed to .github/workflows/generated-code.yml

@@ -1,4 +1,4 @@
-name: Commit generated code to master branch
+name: Generate code and open pull request
 
 on:
   workflow_dispatch:
@@ -24,12 +24,15 @@ jobs:
           python generate-code.py
           diff=$(git --no-pager diff --name-only HEAD)
           echo "DIFF_IS_EMPTY=$([[ -z "$diff" ]] && echo 'true' || echo 'false')" >> $GITHUB_ENV
+          echo "CURRENT_DATETIME=$(date +'%Y%m%d%H%M%S')" >> $GITHUB_ENV
       - if: ${{ env.DIFF_IS_EMPTY != 'true' }}
         run: |
           git config user.name github-actions
           git config user.email github-actions@github.com
+          git checkout -b update-diff-${{ env.CURRENT_DATETIME }}
           git add .
           git commit -m "Code are generated by openapi generator"
-          git push origin master
+          git push origin update-diff-${{ env.CURRENT_DATETIME }}
+          gh pr create -B ${{ github.ref_name }} -t "Codes are generated by openapi generator" -b "" --label "line-openapi-update"
         env:
           GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}