6 to 7 upgrade: can no longer use inventory()

[awtg-elmer]

I am currently working on a WordPress project that still uses v6 and now failing the build.
It can accommodate multistage[dev, test, main] branches previously.
At the moment, our project still uses inventory( ). I found upgrade documentation but I am not sure if in step.7 if it's the sample "deploy.yaml".

If so, how do we configure it for multi-environment?
Below is the current deploy.yaml that's being called in deploy.php by inventory( 'deploy.yml' );

deploy.yml
`.base: &base
hostname: hostname
user: deployer
application: appname
repository: [email protected]:org/repo.git
deploy_path: /var/www/html/
branch: main

dev:
<<: *base
hostname: xx.xx.xx.x
stage: dev
branch: dev

test:
<<: *base
hostname: xx.xx.xx.x
stage: test
branch: test

main:
<<: *base
hostname: xx.xx.xx.x
stage: main
branch: main`

[akosglue]

I think you need top-level hosts, something like this:

.base: &base
  remote_user: app
  port: 22
  identityFile: ~/.ssh/id_rsa
  forwardAgent: true
  multiplexing: false
  keep_releases: 3
  ssh_arguments: ['-o StrictHostKeyChecking=no','-o UserKnownHostsFile=/dev/null']
hosts:
  master:
    <<: *base
    hostname: xxxx
    deploy_path: ~/sites/xxxx
  staging:
    <<: *base
    hostname: xxxx
    deploy_path: ~/sites/xxxx
  dev:
    <<: *base
    hostname: xxxx
    deploy_path: ~/sites/xxxx