Fix panic in kaniko/pkg/util.mkdirAllWithPermissions

[zhangguanzhang]

Signed-off-by: zhangguanzhang zhangguanzhang@qq.com

Fixes #1657

Description

Submitter Checklist

These are the criteria that every PR should meet, please check them off as you
review them:

• Includes unit tests
• Adds integration tests if needed.

See the contribution guide for more details.

Reviewer Notes

• The code flow looks good.
• Unit tests and or integration tests added.

Release Notes

Describe any changes here so maintainer can include it in the release notes, or delete this block.

Examples of user facing changes:
- kaniko adds a new flag `--registry-repo` to override registry

[google-cla]

Thanks for your pull request. It looks like this may be your first contribution to a Google open source project (if not, look below for help). Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

📝 Please visit https://cla.developers.google.com/ to sign.

Once you've signed (or fixed any issues), please reply here with @googlebot I signed it! and we'll verify it.

---

What to do if you already signed the CLA

Individual signers

• It's possible we don't have your GitHub username or you're using a different email address on your commit. Check your existing CLA data and verify that your email is set on your git commits.

Corporate signers

• Your company has a Point of Contact who decides which employees are authorized to participate. Ask your POC to be added to the group of authorized contributors. If you don't know who your Point of Contact is, direct the Google project maintainer to go/cla#troubleshoot (Public version).
• The email used to register you as an authorized contributor must be the email used for the Git commit. Check your existing CLA data and verify that your email is set on your git commits.
• The email used to register you as an authorized contributor must also be attached to your GitHub account.

ℹ️ Googlers: Go here for more info.

[zhangguanzhang]

@googlebot I signed it!

@googlebot I signed it!

[Panlq]

@zhangguanzhang Do you know how to avoid this bug? Please.

[zhangguanzhang]

@zhangguanzhang Do you know how to avoid this bug? Please.

I don't know

[tejal29]

Please add tests so I can consider reviewing this.

[zhangguanzhang]

Please add tests so I can consider reviewing this.

The problem of occasion, I don't know how to write, Golang panic information fan-shaped Ying used the attribute

[imjasonh]

I think this was fixed in #1813 -- please let me know if that's not the case.