You can remotely trigger a build by using the API

First you need to get your auth token:

$ curl -u [email protected] POST -d "" https://build.phonegap.com/token

Test it and retrieve your appid using the following command:

$ curl https://build.phonegap.com/api/v1/me?auth_token=[token]

After this go to your Github repo, open the admin and go to 'Service hooks'. Add a new WebHook URL (first option) and add yours https://build.phonegap.com/apps/[appid]/build/?auth_token=[token]

Save this and trigger it with 'Test hook'. When you would open: https://build.phonegap.com/apps/[appid]/builds you will probably see a new build.