run qbpm --help as install check in nix build

Author: pvsr

flake.nix

@@ -35,6 +35,8 @@
             pkgs.installShellFiles
           ];
           nativeCheckInputs = [ python.pkgs.pytestCheckHook ];
+          doInstallCheck = true;
+          installCheckPhase = "$out/bin/qbpm --help";
           postInstall = ''
             _QBPM_COMPLETE=bash_source $out/bin/qbpm > completions/qbpm.bash
             _QBPM_COMPLETE=zsh_source $out/bin/qbpm > completions/qbpm.zsh