Upload tarball to S3

[doismellburning]

18:01 < doismellburning> I am so very confused about environment variables
18:02 < doismellburning> I have set some AWS keys in https://travis-ci.org/py3minepi/arm-chroot/settings/env_vars
18:02 < doismellburning> but from readinb http://docs.travis-ci.com/user/uploading-artifacts/ and http://docs.travis-ci.com/user/encryption-keys/ and http://docs.travis-ci.com/user/environment-variables/ I am very unclear how to use them to upload my tarballs to S3

[doismellburning]

13:45 < doismellburning> so I have https://github.com/py3minepi/arm-chroot/blob/master/.travis.yml and AWS_ACCESS_KEY etc. are set in the environment via the webui, but I've no idea how to actually use them in the yml file...

[doismellburning]

Fixed by b28339b - thanks to @asarih and @meatballhat

[meatballhat]

😻 yey!