docs(cli): document cloud assembly as a trust boundary - #1983
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Fixes #1919
Developers should only deploy Cloud Assemblies they trust. When synth-ing and deploying on the same machine, there is no trust concern for deployment.
However, if a developer deploys a Cloud Assembly from an external source like
cdk deploy --app /downloaded/file/path/cdk.out, they must trust that source. Deploying using an untrusted Cloud Assembly can run untrusted code within the developer's shell environment and using the developer's AWS credentials.This change document the cloud assembly as an explicit trust boundary in the cdk synth section of the CLI README, and in the
fromAssemblyDirectoryAPI docs.The developer guide has been updated with similar guidance.
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