Adds CodeBuild support for builds that are not initiated via a webhook

[carcer]

The current CodeBuild support only supports retrieving the branch when a build has been initiated via a webhook, mainly GitHub. There are other use cases when a this environment variable will not be populated, and branch name is available via the CODEBUILD_SOURCE_VERSION variable. This PR updates the CodeBuild agent to also check this environment variable.

This does result in a difference from the other build agents, as this involves 2 possible environment variables.

Description

Updates the CodeBuild agent to check the CODEBUILD_SOURCE_VERSION if the value from CODEBUILD_WEBHOOK_BASE_REF is null or empty. Overloads the base class so it no longer uses the EnvironmentVariable property, as there are 2 variables to be checked. Throws an exception if the property is accessed

Motivation and Context

We want to use GItVersion within CodeBuild from builds initiated from Jenkins that are initiated via webhook

How Has This Been Tested?

Added additional unit tests and confirmed they pass

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[asbjornu]

Thanks for your contributions, @carcer! 🙏

[github-actions]

🎉 This issue has been resolved in version 5.6.0 🎉
The release is available on:

• GitHub Release
• Chocolatey Package
• .Net Global Tool

Your GitReleaseManager bot 📦🚀