extend to more AWS regions

[cgwalters]

Today we only upload to a few regions; I'm wary of the costs of uploading every build to all regions.

One path would be for the installer folks, when they pin a release to ping us and we'll run a "buildextend" style invocation that uploads the image to more targeted regions.

Another thing we should probably do is pick at least one region in Europe and one in Asia for all development builds too.

[wking]

Cross-ref https://groups.google.com/forum/m/#!topic/openshift-4-dev-preview/6OLJ1J-UvwU

[ashcrow]

At this point I believe we are now uploading to multiple regions.

[ashcrow]

Closing this issue. Feel free to re-open if I'm mistaken.

[wking]

There are still some regions where we don't upload AMIs (see commented-out regions here). But I'm fine closing this issue and re-opening region-specific issues if/when we get further complaints. I think the real solution to this is going to be cross-region copy-and-encrypt, with Red-Hat-published AMIs living in a single region. We do that for control-plane machines since openshift/installer#1296, but still need machine-API-provider work before we can do it for compute machines.