Update all flake URLs to use the new Forgejo instance. This includes
auto-upgrade, nixos-rebuild-test, homelab-deploy listener, nixos-exporter,
nix-cache02 builder, and the bootstrap script.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
- Configure builder to build nixos-servers and nixos (gunter) repos
- Add builder NKey to Vault secrets
- Update NATS permissions for builder, test-deployer, and admin-deployer
- Grant nix-cache02 access to shared homelab-deploy secrets
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
