[CI] [Buildkite] Feature request: automatically upload core dumps from FreeBSD jobs

[DilumAluthge]

[ararslan]

Note: Needs #42990 as a prerequisite

[vtjnash]

Implemened by https://github.com/JuliaCI/coreupload-buildkite-plugin

[ararslan]

Not really, as FreeBSD CI doesn't yet run on buildkite and some of the scripts in that repository won't work as-is on FreeBSD (in particular, they use #!/bin/bash, which is not a thing on FreeBSD).