feat: implement stackit git instances (#791)

* feat: implement stackit git instances

* review changes

docs/data-sources/git.md

@@ -0,0 +1,38 @@
+---
+# generated by https://github.com/hashicorp/terraform-plugin-docs
+page_title: "stackit_git Data Source - stackit"
+subcategory: ""
+description: |-
+  Git Instance datasource 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_git (Data Source)
+
+Git Instance datasource 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_git" "git" {
+  project_id  = "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
+  instance_id = "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
+}
+```
+
+<!-- schema generated by tfplugindocs -->
+## Schema
+
+### Required
+
+- `instance_id` (String) ID linked to the git instance.
+- `project_id` (String) STACKIT project ID to which the git instance is associated.
+
+### Read-Only
+
+- `id` (String) Terraform's internal resource ID, structured as "`project_id`,`instance_id`".
+- `name` (String) Unique name linked to the git instance.
+- `url` (String) Url linked to the git instance.
+- `version` (String) Version linked to the git instance.

docs/index.md

@@ -159,6 +159,7 @@ Note: AWS specific checks must be skipped as they do not work on STACKIT. For de
 - `dns_custom_endpoint` (String) Custom endpoint for the DNS service
 - `enable_beta_resources` (Boolean) Enable beta resources. Default is false.
 - `experiments` (List of String) Enables experiments. These are unstable features without official support. More information can be found in the README. Available Experiments: [iam]
+- `git_custom_endpoint` (String) Custom endpoint for the Git service
 - `iaas_custom_endpoint` (String) Custom endpoint for the IaaS service
 - `loadbalancer_custom_endpoint` (String) Custom endpoint for the Load Balancer service
 - `logme_custom_endpoint` (String) Custom endpoint for the LogMe service

docs/resources/git.md

@@ -0,0 +1,38 @@
+---
+# generated by https://github.com/hashicorp/terraform-plugin-docs
+page_title: "stackit_git Resource - stackit"
+subcategory: ""
+description: |-
+  Git Instance 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_git (Resource)
+
+Git Instance 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_git" "git" {
+  project_id = "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
+  name       = "git-example-instance"
+}
+```
+
+<!-- schema generated by tfplugindocs -->
+## Schema
+
+### Required
+
+- `name` (String) Unique name linked to the git instance.
+- `project_id` (String) STACKIT project ID to which the git instance is associated.
+
+### Read-Only
+
+- `id` (String) Terraform's internal resource ID, structured as "`project_id`,`instance_id`".
+- `instance_id` (String) ID linked to the git instance.
+- `url` (String) Url linked to the git instance.
+- `version` (String) Version linked to the git instance.