Revert "migrate to container builds"
Revert "migrate to container builds"

This reverts commit 416f497c6c6b96b82b89acc980d176bba5f721eb.

It was causing Travis builds to fail because Google was preventing the
logins.

dvirtz/gmusicapi,simon-weber/gmusicapi,thebigmunch/gmusicapi,tanhaiwang/gmusicapi,simon-weber/Unofficial-Google-Music-API,dvirtz/gmusicapi