Add terraform-rancher repository

Provision the terraform-rancher Gitea repo, which will manage Rancher's
Authentik OIDC auth (keycloakoidc AuthConfig) via the rancher2 provider,
mirroring the terraform-authentik pattern.

config/git.unkin.net/unkin/repository/terraform-rancher.yaml

@@ -0,0 +1,18 @@
+description: "Terraform configuration for managing Rancher (auth, roles) via the rancher2 provider"
+private: false
+default_branch: "main"
+default_delete_branch_after_merge: true
+default_merge_style: "squash"
+branch_protection:
+  - rule_name: "main"
+    enable_push: false
+    merge_whitelist_users:
+      - "benvin"
+      - "unkinben"
+    status_check_contexts:
+      - "ci/woodpecker/pr/pre-commit"
+      - "ci/woodpecker/pr/plan"
+    approval_whitelist_users:
+      - "benvin"
+    approval_whitelist_teams:
+      - "Owners"