Support Azure DevOps Service Connection

[Bouke]

Terraform Version

Terraform v1.9.5
on linux_amd64
+ provider registry.terraform.io/cyrilgdn/postgresql v1.21.1-beta.1

Affected Resource(s)

provider

Terraform Configuration Files

provider "postgresql" {
  host                = azurerm_postgresql_flexible_server.instance.fqdn
  port                = 5432
  database            = "postgres"
  username            = azurerm_postgresql_flexible_server_active_directory_administrator.instance.principal_name
  sslmode             = "require"
  superuser           = false
  azure_identity_auth = true
  azure_tenant_id     = data.azurerm_client_config.current.tenant_id
}

Debug Output

│ Error: DefaultAzureCredential: failed to acquire a token.
│ Attempted credentials:
│ 	EnvironmentCredential: missing environment variable AZURE_CLIENT_ID
│ 	WorkloadIdentityCredential: no client ID specified. Check pod configuration or set ClientID in the options
│ 	ManagedIdentityCredential: no default identity is assigned to this resource
│ 	AzureCLICredential: ERROR: Please run 'az login' to setup account.
│ 
│ 
│   with provider["registry.terraform.io/cyrilgdn/postgresql"],
│   on main.tf line 446, in provider "postgresql":
│  446: provider "postgresql" {

Expected Behavior

Use the service connection's principal to access Azure RM.

Actual Behavior

Doesn't use the service connection's principal, and cannot communicate with Azure RM.

Steps to Reproduce

Run terraform using Azure DevOps Pipeline, using a service connection principal:

- task: TerraformTaskV4@4
  displayName: Build execution plan
  inputs:
    provider: 'azurerm'
    command: 'plan'
    environmentServiceNameAzureRM: '$(azureSubscription)'

Important Factoids

References

• https://learn.microsoft.com/en-us/azure/devops/pipelines/library/connect-to-azure
• Error is same as #385, but here the principal is managed by Azure DevOps