Similar to https://bugs.webkit.org/show_bug.cgi?id=203263, build.webkit.org queues should download the build archive from master when download from S3 fails. This reduces the dependency on amazon S3. Also, it helps in setting up testing instances (e.g.: dev instance) in which builds can work without S3.
Created attachment 418303 [details] Patch
Sample run: https://build.webkit-dev.org/#/builders/35/builds/3
Committed r271802: <https://trac.webkit.org/changeset/271802> All reviewed patches have been landed. Closing bug and clearing flags on attachment 418303 [details].
<rdar://problem/73579124>