feat(packages): add private Terraform module registry (#38040)

Adds a Terraform module registry package type implementing the [module
registry
protocol](https://developer.hashicorp.com/terraform/internals/module-registry-protocol),
so `terraform init` and Terragrunt `tfr://` can resolve modules from
Gitea:

```hcl
module "vpc" {
  source  = "gitea.example.com/owner/vpc/aws"
  version = "~> 1.0"
}
```

- Modules are uploaded with `PUT
/api/packages/-/terraform/modules/{owner}/{name}/{provider}/{version}`
as a `.tar.gz` with the module at its root, stored verbatim and
immutable.
- `X-Terraform-Get` is a short-lived signed URL because Terraform sends
no credentials when downloading the archive.
- The package page shows install snippets, README, the root module's
inputs, outputs and providers, and `modules/*` submodules.
- Metadata is read by a small in-tree HCL scanner instead of
`hashicorp/hcl/v2`, which would add 5 modules and ~1.4 MB to the binary.

Docs: https://gitea.com/gitea/docs/pulls/433

---------

Signed-off-by: Michael Lopez <mickael.lopez@gmail.com>
Co-authored-by: TheFox0x7 <thefox0x7@gmail.com>
Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
Co-authored-by: silverwind <me@silverwind.io>

services/forms/package_form.go

@@ -9,7 +9,7 @@ type PackageCleanupRuleForm struct {
 	middleware.FormDefaultValidator
 	ID            int64
 	Enabled       bool
-	Type          string `binding:"Required;In(alpine,arch,cargo,chef,composer,conan,conda,container,cran,debian,generic,go,helm,maven,npm,nuget,pub,pypi,rpm,rubygems,swift,terraform,vagrant)"`
+	Type          string `binding:"Required;In(alpine,arch,cargo,chef,composer,conan,conda,container,cran,debian,generic,go,helm,maven,npm,nuget,pub,pypi,rpm,rubygems,swift,terraform,terraform-module,vagrant)"`
 	KeepCount     int    `binding:"In(0,1,5,10,25,50,100)"`
 	KeepPattern   string `binding:"RegexPattern"`
 	RemoveDays    int    `binding:"In(0,7,14,30,60,90,180)"`

services/packages/packages.go

@@ -437,6 +437,8 @@ func CheckSizeQuotaExceeded(ctx context.Context, doer, owner *user_model.User, p
 		typeSpecificSize = setting.Packages.LimitSizeRubyGems
 	case packages_model.TypeSwift:
 		typeSpecificSize = setting.Packages.LimitSizeSwift
+	case packages_model.TypeTerraformModule:
+		typeSpecificSize = setting.Packages.LimitSizeTerraformModule
 	case packages_model.TypeTerraformState:
 		typeSpecificSize = setting.Packages.LimitSizeTerraformState
 	case packages_model.TypeVagrant: