Fix: vercel_project_domain should wait SSL certificate to be considered deployed

[polo4096]

When deploying a project domain for a Pre-production /Custom environment, vercel_project_domain should wait to be fully deployed with SSL certificate so any resources depending on it won't fail as vercel_alias.

resource "vercel_deployment" "example" {
  project_id  = data.vercel_project.example.id
  files       = data.vercel_prebuilt_project.example.output
  path_prefix = data.vercel_prebuilt_project.example.path
  production = false
}

resource "vercel_project_domain" "example" {
  project_id = data.vercel_project.example.id
  domain = "www.example.com"
}

resource "vercel_alias" "example" {
  alias = vercel_project_domain.example.domain
  deployment_id = vercel_deployment.reconditioning.id
}

We'll get this error :

│ Error: Error creating alias
│ 
│   with vercel_alias.example,
│   on main.tf line 21, in resource "vercel_alias" "example":
│   21: resource "vercel_alias" "example" {
│ 
│ Could not create alias, unexpected error: cert_missing - The domain you are trying to associate is missing a SSL certificate

Retrying a few seconds later to apply vercel_alias will success as SSL certificate will be emitted.