terraform state registry docs (#357)

https://github.com/go-gitea/gitea/pull/36710
Reviewed-on: https://gitea.com/gitea/docs/pulls/357
Reviewed-by: Nicolas <173651+bircni@noreply.gitea.com>
Co-authored-by: TheFox0x7 <95654+thefox0x7@noreply.gitea.com>
Co-committed-by: TheFox0x7 <95654+thefox0x7@noreply.gitea.com>

docs/administration/config-cheat-sheet.md

@@ -1454,6 +1454,7 @@ in this mapping or the filetype using heuristics.
 - `LIMIT_SIZE_RUBYGEMS`: **-1**: Maximum size of a RubyGems upload (`-1` means no limits, format `1000`, `1 MB`, `1 GiB`)
 - `LIMIT_SIZE_SWIFT`: **-1**: Maximum size of a Swift upload (`-1` means no limits, format `1000`, `1 MB`, `1 GiB`)
 - `LIMIT_SIZE_VAGRANT`: **-1**: Maximum size of a Vagrant upload (`-1` means no limits, format `1000`, `1 MB`, `1 GiB`)
+- `LIMIT_SIZE_TERRAFORM_STATE``: **-1**: Maximum size of a Terraform state upload (`-1` means no limits, format `1000`, `1 MB`, `1 GiB`)
 
 ## Mirror (`mirror`)
 

docs/usage/packages/overview.md

@@ -35,6 +35,7 @@ The following package managers are currently supported:
 | [RPM](usage/packages/rpm.md) | - | `yum`, `dnf`, `zypper` |
 | [RubyGems](usage/packages/rubygems.md) | Ruby | `gem`, `Bundler` |
 | [Swift](usage/packages/swift.md) | Swift | `swift` |
+| [Terraform](usage/packages/terraform.md) | - | `terraform` |
 | [Vagrant](usage/packages/vagrant.md) | - | `vagrant` |
 
 **The following paragraphs only apply if Packages are not globally disabled!**

docs/usage/packages/terraform.md

@@ -0,0 +1,99 @@
+---
+date: "2026-03-04T00:00:00+00:00"
+slug: "terraform"
+sidebar_position: 118
+---
+
+# Terraform State Registry
+
+Publish terraform states to sync it between multiple users or CI system.
+
+## Requirements
+
+To work with the Terraform State registry, you need to use [Terraform](https://www.terraform.io/) or [OpenTofu](https://opentofu.org/).
+
+## Configuring the package registry
+
+To use the Gitea Terraform State registry, you need to configure the `http` backend in your Terraform configuration.
+
+```hcl
+terraform {
+  backend "http" {
+    address        = "https://gitea.example.com/api/packages/{owner}/terraform/state/{name}"
+    lock_address   = "https://gitea.example.com/api/packages/{owner}/terraform/state/{name}/lock"
+    unlock_address = "https://gitea.example.com/api/packages/{owner}/terraform/state/{name}/lock"
+    lock_method    = "POST"
+    unlock_method  = "DELETE"
+    username       = "{username}"
+    password       = "{password_or_token}"
+  }
+}
+```
+
+| Placeholder | Description |
+| ----------- | ----------- |
+| `owner`     | The owner of the state (user or organization). |
+| `name`      | The name of the state. |
+| `username`  | Your Gitea username. |
+| `password`  | Your Gitea password or [personal access token](development/api-usage.md#authentication). |
+
+If you are using 2FA or OAuth use a [personal access token](development/api-usage.md#authentication) instead of the password.
+
+## Initialize the backend
+
+After configuring the backend, you can initialize it with:
+
+```shell
+terraform init
+```
+
+Terraform will prompt you to migrate your state if you already have one locally.
+
+## State Locking
+
+Gitea supports state locking to prevent concurrent modifications. The `lock_address` and `unlock_address` should point to the `/lock` sub-route of your state URL.
+
+- **Locking**: Performed via a `POST` request to `{address}/lock`.
+- **Unlocking**: Performed via a `DELETE` request to `{address}/lock`.
+
+Terraform handles these requests automatically when configured as shown above.
+
+## Encrypted state
+
+The state registry supports [encrypted state](https://opentofu.org/docs/language/state/encryption/).
+
+## State Versions and Management
+
+Gitea keeps track of your Terraform state versions. You can use the API to retrieve or delete specific versions.
+
+### Fetch state
+
+To fetch the latest version of a state:
+
+```shell
+curl --user {username}:{password_or_token} \
+     https://gitea.example.com/api/packages/{owner}/terraform/state/{name}
+```
+
+To fetch a specific version by its serial number:
+
+```shell
+curl --user {username}:{password_or_token} \
+     https://gitea.example.com/api/packages/{owner}/terraform/state/{name}/versions/{serial}
+```
+
+### Delete state
+
+To delete the entire state and all its versions:
+
+```shell
+curl --user {username}:{password_or_token} -X DELETE \
+     https://gitea.example.com/api/packages/{owner}/terraform/state/{name}
+```
+
+To delete a specific version by its serial number:
+
+```shell
+curl --user {username}:{password_or_token} -X DELETE \
+     https://gitea.example.com/api/packages/{owner}/terraform/state/{name}/versions/{serial}
+```