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The AWS provider is a pretty thin wrapper around the AWS API. For now though, I think you could use the Pulumi Command provider to run this on your "web" dir. This should be close to a working example:

import { local } from "@pulumi/command";

const bucket = // your bucket declaration

const webUpload = new local.Command("web", {
  create: pulumi.interpolate`
wget <https://example.com/mywebstuff.zip> | unzip -d /tmp/web
aws s3 sync /tmp/web s3://${bucket.bucket}/web
`, 
  // you may want to examine what "s3 sync" args you want, such as:
  // --delete (delete files that don't exist in the remote dir)
  // --acl public-read if you want files to be internet accessible
  // etc.

  triggers: [datetime.now()] // will run every time.
});

Okay I’ll take the Command provider for a spin, thanks. Unfortunate it isn’t provided directly, I feel this must be a common use case.