Create index file for S3 downloads

Merged Tomasz Maczukin requested to merge feature/s3-download-index-file into master

What does this MR do?

Adds the step in release scripts that creates an index.html file with links to all files uploaded with a release to S3.

Why was this MR needed?

Are there points in the code the reviewer needs to double check?

Does this MR meet the acceptance criteria?

  • Documentation created/updated
  • Tests
    • Added for this feature/bug
    • All builds are passing
  • Branch has no merge conflicts with master (if you do - rebase it please)

What are the relevant issue numbers?