Due to the architectural design in Cloud Deploy, a single pipeline is designed to deploy only one type of target. While you can have multiple targets within one pipeline, but they must all be the same type (like GKE, all Cloud Run, etc.).

Currently, Cloud Deploy does not support different target types within a single pipeline because each type has unique configuration and requirements, such as different deployment processes, tooling and API. Combining multiple target types in one pipeline would make it more complex to understand, maintain, and debug, leading to more complicated setups. The recommended approach in Cloud Deploy is to create separate pipelines for each target environment. For further reference you can check this documentation.

You can also make a feature request to Google Cloud for this functionality and you can explain the challenges you’re encountering with the current approach would be helpful.