Fix the git branch check.

[mashhurs]

Release notes

[rn:skip]

What does this PR do?

Replaces git show-ref with git checkout to fix the issue where show-ref is not showing the branch needs to be checked out.

Why is it important/What is the impact to the user?

Not user impacted.

Checklist

• My code follows the style guidelines of this project
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [ ] I have made corresponding change to the default configuration files (and/or docker env variables)
• [ ] I have added tests that prove my fix is effective or that my feature works

Author's Checklist

• [ ]

How to test this PR locally

Related issues

Use cases

Screenshots

Logs

• when branch exists

➜  logstash git:(upstream-main) ✗ ./.buildkite/scripts/snyk/report.sh
08e2162ee8a00616f207ce7797e1bee477d4e7bf
Reporting 8.13 branch.
0600ff98bbd54918c8d18d2e4372f96c71dc235c
Reporting main branch.

• when branch doesn’t exist

➜  logstash git:(upstream-main) ✗ ./.buildkite/scripts/snyk/report.sh
fatal: Needed a single revision
8.14 branch doesn't exist.
0600ff98bbd54918c8d18d2e4372f96c71dc235c
Reporting main branch.

[elastic-sonarqube]

Quality Gate passed

Kudos, no new issues were introduced!

0 New issues
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarQube

[elasticmachine]

💚 Build Succeeded

• Buildkite Build
• Commit: e407c3a

History

• 💚 Build #1012 succeeded 9c9537d
• 💚 Build #1010 succeeded efda13b
• 💚 Build #1009 succeeded 601960b

cc @mashhurs

[jsvd]

LGTM