Documented `sleeper cdk bootstrap` command does not work

[patchwork01]

Description / Background

When you run sleeper cdk bootstrap you get java.lang.IllegalArgumentException: instanceId is required.

Steps to reproduce

1. Install the Sleeper CLI
2. Run sleeper cdk bootstrap
3. See error

Expected behaviour

The AWS account should be bootstrapped.

Technical Notes / Implementation Details

This is happening because the cdk.json file in the default directory of the environment Docker image points the CDK to the environment CDK app.

This is in scripts/cli/environment/cdk.json, alongside the Dockerfile that includes it.