Summarily, upload-artifact v3 is deprecated but v4 doesn't support mutating an artifact with the name name by uploading different filepaths to the same artifact. Because we need a single artifact "github.sha", we have to use actions/merge to create it. Alternatively craft could be modified but this is the easiest way forward and I like the idea of a unified artifact, it makes craft simpler.
Supersedes https://github.com/getsentry/symbolicator/pull/1503 by using artifacts/merge to merge together multiple artifacts from different jobs into the single one named github.sha that craft expects.
Summarily, upload-artifact v3 is deprecated but v4 doesn't support mutating an artifact with the name name by uploading different filepaths to the same artifact. Because we need a single artifact "github.sha", we have to use actions/merge to create it. Alternatively craft could be modified but this is the easiest way forward and I like the idea of a unified artifact, it makes craft simpler.
ref: https://github.com/getsentry/craft/issues/552