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what I have is 1 project called demo, and under that muliple stacks

demo
├── infra
│   ├── cassandra.go
│   ├── go.mod
│   ├── go.sum
│   ├── main.go
│   └── webserver.go
├── Pulumi.yaml
├── README.md
└── stacks
    ├── Pulumi.dev.yaml
    └── Pulumi.staging.yaml

and in Pulumi.yaml

❯ cat demo/Pulumi.yaml
name: demo
runtime: go
description: A minimal Azure Go Pulumi program
config: stacks/ # all stack files are stored under stacks/ folder
main: infra/ # main.go stored under infra/ folder

ok, and how do you deploy a given stack?

pulumi stack select <stack name>

nice, will try, thanks.