feat: add stackit service account creation to tf provider (#708)

* feat: implement service account resource/datasource

docs/data-sources/service_account.md

@@ -0,0 +1,36 @@
+---
+# generated by https://github.com/hashicorp/terraform-plugin-docs
+page_title: "stackit_service_account Data Source - stackit"
+subcategory: ""
+description: |-
+  Service account data source schema.
+  ~> This resource is in beta and may be subject to breaking changes in the future. Use with caution. See our guide https://registry.terraform.io/providers/stackitcloud/stackit/latest/docs/guides/opting_into_beta_resources for how to opt-in to use beta resources.
+---
+
+# stackit_service_account (Data Source)
+
+Service account data source schema.
+
+~> This resource is in beta and may be subject to breaking changes in the future. Use with caution. See our [guide](https://registry.terraform.io/providers/stackitcloud/stackit/latest/docs/guides/opting_into_beta_resources) for how to opt-in to use beta resources.
+
+## Example Usage
+
+```terraform
+data "stackit_service_account" "sa" {
+  project_id = "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
+  email      = "sa01-8565oq1@sa.stackit.cloud"
+}
+```
+
+<!-- schema generated by tfplugindocs -->
+## Schema
+
+### Required
+
+- `email` (String) Email of the service account.
+- `project_id` (String) STACKIT project ID to which the service account is associated.
+
+### Read-Only
+
+- `id` (String) Terraform's internal resource ID, structured as "`project_id`,`email`".
+- `name` (String) Name of the service account.

docs/index.md

@@ -176,6 +176,7 @@ Note: AWS specific checks must be skipped as they do not work on STACKIT. For de
 - `secretsmanager_custom_endpoint` (String) Custom endpoint for the Secrets Manager service
 - `server_backup_custom_endpoint` (String) Custom endpoint for the Server Backup service
 - `server_update_custom_endpoint` (String) Custom endpoint for the Server Update service
+- `service_account_custom_endpoint` (String) Custom endpoint for the Service Account service
 - `service_account_email` (String, Deprecated) Service account email. It can also be set using the environment variable STACKIT_SERVICE_ACCOUNT_EMAIL. It is required if you want to use the resource manager project resource.
 - `service_account_key` (String) Service account key used for authentication. If set, the key flow will be used to authenticate all operations.
 - `service_account_key_path` (String) Path for the service account key used for authentication. If set, the key flow will be used to authenticate all operations.

docs/resources/service_account.md

@@ -0,0 +1,36 @@
+---
+# generated by https://github.com/hashicorp/terraform-plugin-docs
+page_title: "stackit_service_account Resource - stackit"
+subcategory: ""
+description: |-
+  Service account resource schema.
+  ~> This resource is in beta and may be subject to breaking changes in the future. Use with caution. See our guide https://registry.terraform.io/providers/stackitcloud/stackit/latest/docs/guides/opting_into_beta_resources for how to opt-in to use beta resources.
+---
+
+# stackit_service_account (Resource)
+
+Service account resource schema.
+
+~> This resource is in beta and may be subject to breaking changes in the future. Use with caution. See our [guide](https://registry.terraform.io/providers/stackitcloud/stackit/latest/docs/guides/opting_into_beta_resources) for how to opt-in to use beta resources.
+
+## Example Usage
+
+```terraform
+resource "stackit_service_account" "sa" {
+  project_id = "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
+  name       = "sa01"
+}
+```
+
+<!-- schema generated by tfplugindocs -->
+## Schema
+
+### Required
+
+- `name` (String) Name of the service account.
+- `project_id` (String) STACKIT project ID to which the service account is associated.
+
+### Read-Only
+
+- `email` (String) Email of the service account.
+- `id` (String) Terraform's internal resource ID, structured as "`project_id`,`email`".