✨ speed up image sync by replacing s3cmd with awscli

[Marigold]

s3cmd is really slow. Syncing images takes more than 3 minutes now, which is considerable time for our staging servers. Switching to awscli reduces the time to about 15s. (I'm not sure why is it so much faster, parallel sync perhaps?)

Moreover, using .aws/config is more intuitive than ~/.s3cfg

[Marigold]

Eh, damn. aws s3 sync doesn't transfer public/private permissions. We'd have to run it with --acl public-read, but that would make all objects public. @ikesau do we have any private images?

[ikesau]

As far as I know, no.

Images from unpublished articles are "private" in one sense, but I doubt there's anything actually sensitive in them. Worst case, they still have typos or something.

Worth checking with our authors, just to make sure.

[Marigold]

Thanks! I went over all images in that bucket and none of them was private. Merging this as it impacts staging server performance a lot.