add if section in the restore branch step of the Release action

[hakuturu583]

Description

Abstract

Fixed a bug that caused release actions to fail when an external contributor opened a pull request from a forked repository.

Background

This step is intended to restore a branch that was inadvertently deleted at the same time as a merge, and is set up so that it can work even if there is an operational error.
However, when a pull request is received from an external repository, the branch to be restored does not exist and an error occurs.

Details

I introduced an option to ignore the error so that pull requests from external repositories can be merged.

References

#1242

Destructive Changes

N/A

Known Limitations

N/A

[github-actions]

Checklist for reviewers ☑️

All references to "You" in the following text refer to the code reviewer.

• Is this pull request written in a way that is easy to read from a third-party perspective?
• Is there sufficient information (background, purpose, specification, algorithm description, list of disruptive changes, and migration guide) in the description of this pull request?
• If this pull request contains a destructive change, does this pull request contain the migration guide?
• Labels of this pull request are valid?
• All unit tests/integration tests are included in this pull request? If you think adding test cases is unnecessary, please describe why and cross out this line.
• The documentation for this pull request is enough? If you think adding documents for this pull request is unnecessary, please describe why and cross out this line.

[HansRobo]

I would appreciate it if you could work on this PR in your spare time.
(Every morning, I get a notification from GitHub to review this.)

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud