clan-cli: Add --show-trace to nix build and nixos-rebuild commands

pkgs/clan-cli/clan_cli/machines/update.py

@@ -109,6 +109,7 @@ def deploy_machine(machines: MachineGroup) -> None:
         cmd = [
             "nixos-rebuild",
             "switch",
+            "--show-trace",
             "--fast",
             "--option",
             "keep-going",

pkgs/clan-cli/clan_cli/nix/__init__.py

@@ -35,6 +35,7 @@ def nix_build(flags: list[str], gcroot: Path | None = None) -> list[str]:
                     str(gcroot),
                     "--print-out-paths",
                     "--no-write-lock-file",
+                    "--show-trace",
                 ]
             )
             + flags
@@ -47,6 +48,7 @@ def nix_build(flags: list[str], gcroot: Path | None = None) -> list[str]:
                     "--no-link",
                     "--print-out-paths",
                     "--no-write-lock-file",
+                    "--show-trace",
                 ]
             )
             + flags