treewide: add meta.mainProgram to packages with a single binary

The nixpkgs-unstable channel's programs.sqlite was used to identify
packages producing exactly one binary, and these automatically added
to their package definitions wherever possible.

pkgs/development/python-modules/ansible/default.nix

@@ -80,6 +80,7 @@ buildPythonPackage {
 
   meta = with lib; {
     description = "Radically simple IT automation";
+    mainProgram = "ansible-community";
     homepage = "https://www.ansible.com";
     changelog = "https://github.com/ansible-community/ansible-build-data/blob/${version}/${lib.versions.major version}/CHANGELOG-v${lib.versions.major version}.rst";
     license = licenses.gpl3Plus;