aws-cdk-lib/pipelines: CodeBuildStep should support CodePipeline variables

[jpeinola]

The current CodeBuildStep API doesn't include variable property and CodeBuildStepProps doesn't include variablesNamespace property. As a result variables exported in CodeBuild (exporting variable using export VARIABLE_NAME in script and defining the variable in buildspec's env-block using exported-variables) are not visible as CodePipeline variables.

Currently this can be done by using CodeBuildAction from codepipeline_actions library along with ICodePipelineActionFactory. However, implementing this kind of wrapper creates unnecessary increase in the amount of code.

Use Case

In some cases I need to resolve artifact version in CodeBuild and pass it to downstream actions in pipeline.

Proposed Solution

1. Extend CodeBuildStepProps API to take variablesNamespace and expose variables exported in CodeBuild to CodePipeline variables.
2. Extend CodeBuildStep API to include variable-property so the variables defined in CodeBuildStep can be referenced in downstream actions using syntax like myCodeBuildStep.variable('MY_FUNNY_VARIABLE') in cdk code.

Other

• 👋 I may be able to implement this feature request
• ⚠️ This feature might incur a breaking change

---

This is a 🚀 Feature Request

[rix0rrr]

Duplicate of #15943 and #16407.

[github-actions]

⚠️COMMENT VISIBILITY WARNING⚠️

Comments on closed issues are hard for our team to see.
If you need more assistance, please either tag a team member or open a new issue that references this one.
If you wish to keep having a conversation with other community members under this issue feel free to do so.