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So, you should and WILL ONLY do this in dev.

Add one of these to blocks to your virtualhost:

<VirtualHost *:80>
ProxyPass /myapp/ http://127.0.0.1:8080/myapp/
ProxyPassReverse /myapp/ http://127.0.0.1:8080/myapp/
....

or:
<Location /myapp>
ProxyPass http://127.0.0.1:8080/myapp
</Location>

In your app's config file, modify the following section with your path:
environments {
development {
grails.serverURL = "http://YOUR_IP_ADDRESS_OR_DOMAIN_GOES_HERE/${appName}"
}
}

Start up your app:
grails run-app

Then restart Apache:
sudo apachectl restart

Now browse to your ip:
http://127.0.0.1/myapp/

If you open up a port on your firewall, you can use your outside ip / domain name