Way to migrate application across PipeCD projects

[khanhtc1202]

What would you like to be added:

Why is this needed:

In some use cases, users want to move/migrate one application from a PipeCD project to another project without downtime. Currently, it's hard to make it due to the PipeCD resource control mechanism (based on the resource annotations).

[t-kikuc]

Investication Result for ECS/Lambda

Kubernetes, CloudRun, Terraform: I have not investigated yet. Anyone, please try 🙏

It's easy to migrate app across projects for ECS/Lambda apps.

• 👍 No downtime
• 👍 AWS resources are the same through migration
• 👍 You don't need to modify application configs
• ⚠️ If the first deployment of an app fails, the Rollback will fail. Re-deploy the app in your "migration-from" project.

Details: I wrote an article in Japanese.
"How to migrate apps across projects: ECS/Lambda"
https://zenn.dev/cadp/articles/pipecd-migrate-apps-across-projects