feat: make kubeadm workflows auto-scale with terraform outputs

nixos/kubeadm/scripts/render-inventory-from-tf-output.py

@@ -0,0 +1,40 @@
+#!/usr/bin/env python3
+
+import json
+import os
+import re
+import sys
+
+
+def natural_key(name: str):
+    m = re.match(r"^([a-zA-Z-]+)-(\d+)$", name)
+    if m:
+        return (m.group(1), int(m.group(2)))
+    return (name, 0)
+
+
+def map_to_pairs(items: dict[str, str]) -> str:
+    ordered = sorted(items.items(), key=lambda kv: natural_key(kv[0]))
+    return " ".join(f"{k}={v}" for k, v in ordered)
+
+
+def main() -> int:
+    payload = json.load(sys.stdin)
+
+    cp_map = payload.get("control_plane_vm_ipv4", {}).get("value", {})
+    wk_map = payload.get("worker_vm_ipv4", {}).get("value", {})
+
+    if not cp_map or not wk_map:
+      raise SystemExit("Missing control_plane_vm_ipv4 or worker_vm_ipv4 in terraform output")
+
+    ssh_user = os.environ.get("KUBEADM_SSH_USER", "").strip() or "micqdf"
+
+    print(f"SSH_USER={ssh_user}")
+    print("PRIMARY_CONTROL_PLANE=cp-1")
+    print(f"CONTROL_PLANES=\"{map_to_pairs(cp_map)}\"")
+    print(f"WORKERS=\"{map_to_pairs(wk_map)}\"")
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())