[pipelines]: Can't get stack outputs in subsequent steps

[flochaz]

Can't get stack outputs in subsequent steps since Namespace is not set on Default Cloudformation Execution step generated by cdk pipelines construct.

I wasn't able to find a way to set this namespace except by adding a dummy ShellStep referencing my outputs in envFromCfnOutputs and looking at the code it looks like that only if step of type ShellStep is generating the namespace addition.

Reproduction Steps

1. Create a pipeline with cdk pipelines construct (example)
2. Add a step (of any kind but not ShellStep) in your stage with ref to stack outputs (example)
3. Check if namespace is set in execute step => it won't be

What did you expect to happen?

Namespace always set to stack name in Execute CFN step

What actually happened?

Namespace not set and therefore we can't access stacks output in subsequent steps.

Environment

• **CDK CLI Version :1.118.0
• **Language (Version):Typescript

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This is 🐛 Bug Report

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