Added authentik terraform

terraform/authentik/README.md

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+# Authentik Terraform Module
+
+Terraform module for managing Authentik applications with OAuth2/OpenID and Proxy providers, including automatic Outpost assignment.
+
+## Usage
+
+```hcl
+module "authentik" {
+  source = "./authentik"
+
+  authentik_url   = "https://auth.example.com"
+  authentik_token = var.authentik_token
+
+  oauth_applications = {
+    "gitlab" = {
+      name         = "GitLab OAuth"
+      slug         = "gitlab"
+      redirect_uris = ["https://gitlab.example.com/users/auth/openid_connect/callback"]
+    }
+  }
+
+  proxy_applications = {
+    "portainer" = {
+      name          = "Portainer"
+      slug          = "portainer"
+      external_host = "https://portainer.example.com"
+      internal_host = "http://portainer:9000"
+      outpost       = "k8s-outpost"
+    }
+  }
+
+  outposts = {
+    "k8s-outpost" = {
+      name = "Kubernetes Outpost"
+      type = "proxy"
+      service_connection = "k8s-local"
+    }
+  }
+}
+```
+
+## Structure
+
+- `main.tf` - Main configuration
+- `variables.tf` - Input variables  
+- `outputs.tf` - Output values
+- `modules/oauth-provider/` - OAuth2/OIDC provider module
+- `modules/proxy-provider/` - Proxy provider module
+- `terraform.tfvars.example` - Configuration example
+
+## Requirements
+
+- Terraform >= 1.0
+- Authentik provider >= 2023.10.0
+- Authentik API token with admin permissions