terraform+nix: Hetzner orchestrator server (cpx11, nixos-infect, cc-ci-orchestrator-hetzner flake host)

Adds terraform/ to provision a Hetzner cpx11 (2 vCPU / 2 GB dedicated AMD / 40 GB NVMe)
for the loops runtime, and a flake + NixOS host config to converge it — replacing the slow
b1 Incus VM. Mirrors the cc-ci server terraform (same nixos-infect pin, same pattern).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

flake.nix

@@ -0,0 +1,29 @@
+{
+  description = "cc-ci-orchestrator — NixOS host for the cc-ci loops runtime (Builder/Adversary/Watchdog)";
+
+  inputs = {
+    # Pinned to the same revision as the cc-ci server for ecosystem consistency.
+    nixpkgs.url = "github:NixOS/nixpkgs/50ab793786d9de88ee30ec4e4c24fb4236fc2674";
+
+    # Same pin as cc-ci server (buildGo125Module compatibility with nixpkgs 24.11).
+    sops-nix.url = "github:Mic92/sops-nix/77c423a03b9b2b79709ea2cb63336312e78b72e2";
+    sops-nix.inputs.nixpkgs.follows = "nixpkgs";
+  };
+
+  outputs = { nixpkgs, sops-nix, ... }:
+    let
+      system = "x86_64-linux";
+    in
+    {
+      # Hetzner cpx11 host (nixos-infect generated hardware.nix + orchestrator config).
+      # Provision with terraform/ then run Stage 2 per terraform/README.md.
+      nixosConfigurations.cc-ci-orchestrator-hetzner = nixpkgs.lib.nixosSystem {
+        inherit system;
+        modules = [
+          sops-nix.nixosModules.sops
+          ./nix/hosts/cc-ci-orchestrator-hetzner/hardware.nix
+          ./nix/hosts/cc-ci-orchestrator-hetzner/configuration.nix
+        ];
+      };
+    };
+}