Add AWS native functionality

[kcieplak]

• Based on the configuration variable AWS_S3_DIRECT_ACCESS read build logs, documentation and readme files directly from S3, rather than the S3 web frontend.
  • Add handling of root urls to map to index.html
• Based on AWS_USE_IAM_ROLE use instance roles to access S3 rather than access key/secret
• Based on ENABLE_PACKAGE_UPLOAD_PRESIGNED_URLS and ENABLE_BUILD_LOGS_PRESIGNED_URLS, create presigned URLs to pass to builders for logs and docs upload.
• Add functionality to the Dockerfile to be able to build spi in debug vs release
• Do not add back cookies in responses, the site does not use cookies.
• Make the gitlab project id for build triggers configurable via GITLAB_PROJECT_ID *

[finestructure]

This raises a warning

Unstructured throwing task created by 'init(name:priority:operation:)' is not used, which may accidentally ignore errors thrown inside the task

We have a construct

try await run { ... }
defer: {
   try await client.shutdown()
}

(see above in the same file, line 63ff) in order to deal with async defer.

[finestructure]

Having some issues getting tests to pass with this branch. I'll see if it's on my end and if there are any changes, I'll roll them all up into a PR on top of this PR rather than sprinkle lots of comments on this one here.