bug#52807: Guix home executables are not executable

[Nick Zalutskiy]

I'd like to use `guix home` to symlink an executable into my home directory.

Following simple configuration stored at `~/.dotfiles/home-configuration.scm`

(use-modules

  (gnu home)

  (gnu packages)

  (gnu home services)

  (gnu services)

  (guix gexp)

  (gnu home services shells))

(home-environment

  (services

    (list (service

            home-bash-service-type

            (home-bash-configuration

          (guix-defaults? #t)))

      (simple-service 'my-files

              home-files-service-type

              `(("run" ,(local-file "run")))))))

`~/.dotfiles/run` is an executable file, after home reconfigure a `~/.run` symlink is created, however the file it is pointing to does _not_ have the execute bit set.

As a result, when I try to execute `~/.run` file I get a "Permission denied" error.

Thank you,

-Nick