config/autoload/mail.local.php.dist is left untracked after composer install

[dq042000]

I cloned the repo, ran composer install, and git status was already dirty:

$ git status --short
?? config/autoload/mail.local.php.dist

The file comes from bin/composer-post-install-script.php, which copies the dot-mail template to both config/autoload/mail.local.php and config/autoload/mail.local.php.dist. The first one is covered by *.local.php in config/autoload/.gitignore, the second one isn't, so it stays in git status and is easy to commit by accident.

Should it be gitignored, or tracked like the other .dist files in that directory? Happy to send a PR either way.

Seen on 7.0 at 3b5d001.