Amazon eventually will deprecate path-style URLS like https://s3.amazonaws.com/mciuploads. We should update the s3 download url to use the preferred virtual-host style of https://mciuploads.s3.amazonaws.com.

We could also support downloading libmongocrypt-all.tar.gz from the all task rather than single builds.

Also look to make publishing off main tags automatic via evergreen.