Feature: S3 Upload

[YOU54F]

I wrote a feature that would allow users to upload their files to an S3 bucket (public read only), and serve up a link in the slack message.

For various reasons, I never wired it up, but the code is there

https://github.com/YOU54F/cypress-slack-reporter/blob/master/src/uploads3/upload.new.ts

Drop me a thumbs up if you want to see the feature and it would be useful.

I went for public read only, as I don't how how people will be able to view assets served from a private bucket, from the slack message.