feature(datasource): support more argocd datasource

[incubator4]

Description

Currently, the Argo CD Terraform provider only supports the argocd_application data source. This is very useful, but it would be a significant enhancement to also have data sources for other core Argo CD resources.
Such as:

• argocd_applicationset
• argocd_project
• argocd_cluster

Having these data sources would allow us to read existing configurations directly from Argo CD, which is essential for managing dependencies and integrating with other Terraform resources. For example, we could use a data source to get details about an existing ApplicationSet or look up a specific project's configuration before creating or managing other resources.

I'm glad to contribute code for this feature.

Potential Terraform Configuration

datasource "argocd_cluster" "cluster" {
  # or any other selector
  name = "example-cluster"
}

datasource "argocd_project" "project" {
  # or any other selector
  name = "example-project"
}

resource "argocd_application" "multiple_sources" {
  metadata {
    name      = "helm-app-with-external-values"
    namespace = "argocd"
  }

  spec {
    project = datasource.argocd_project.project.name
    source {
      repo_url        = "https://charts.helm.sh/stable"
      chart           = "wordpress"
      target_revision = "9.0.3"
      helm {
        value_files = ["$values/helm-dependency/values.yaml"]
      }
    }

    source {
      repo_url        = "https://github.com/argoproj/argocd-example-apps.git"
      target_revision = "HEAD"
      ref             = "values"
    }

    destination {
      server    = datasource.argocd_cluster.cluster.server
      namespace = "default"
    }
  }
}

References

Community Note

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