disable gpg sign for release-2.11.0

[MinerYang]

Thank you for contributing to Harbor!

Comprehensive Summary of your change

Issue being fixed

Fixes #(issue)

Please indicate you've done the following:

• [ ] Well Written Title and Summary of the PR
• [ ] Label the PR as needed. "release-note/ignore-for-release, release-note/new-feature, release-note/update, release-note/enhancement, release-note/community, release-note/breaking-change, release-note/docs, release-note/infra, release-note/deprecation"
• [ ] Accepted the DCO. Commits without the DCO will delay acceptance.
• [ ] Made sure tests are passing and test coverage is added if needed.
• [ ] Considered the docs impact and opened a new docs issue or PR with docs changes if needed in website repository.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Please upload report for BASE (release-2.11.0@f7f4b03). Learn more about missing BASE report.

Additional details and impacted files

[](https://app.codecov.io/gh/goharbor/harbor/pull/21168?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=goharbor) ```diff @@ Coverage Diff @@ ## release-2.11.0 #21168 +/- ## ================================================= Coverage ? 66.31% ================================================= Files ? 1044 Lines ? 113927 Branches ? 2845 ================================================= Hits ? 75550 Misses ? 34255 Partials ? 4122 ``` | [Flag](https://app.codecov.io/gh/goharbor/harbor/pull/21168/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=goharbor) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/goharbor/harbor/pull/21168/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=goharbor) | `66.31% <ø> (?)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=goharbor#carryforward-flags-in-the-pull-request-comment) to find out more.

[reasonerjt]

Please also skip the release note.