I would like to add that, I personally find github not the best place for metadata. First you can’t get short link out of the box(sub 64 symbols). Because of this we will need to generate url by git.io, what I don’t know how long will store links, probably not forever, so this is another concern.
Additionally I was not able to make metadata file url(long one before we shorten it with git.io) constant(github or gist), every-time I updated some data, it created new commit and raw data had new link, so this lead to short link to not work and needed to generate new one. Or maybe I just don’t know how to do this.
All of this lead to a lot of complication in such simple process - uploading file to internet.
At the end I decided to go with S3. I pay 0 for it and it works flawlessly, with short URL straightaway, but there are some pitfalls too, so if you never used it, maybe it will not be the best choice.
And seems git.io do not accept new links to shorten, anymore