Merge pull request #14319 from grahamc/jenkins

jenkins: copy .war to $out, fixes #14137

pkgs/development/tools/continuous-integration/jenkins/default.nix

···
     maintainers = [ maintainers.coconnor ];
   };
 
-  buildCommand = "ln -s $src $out";
+  buildCommand = "cp $src $out";
 }