internal/ci: stop generating checksums.txt as a release archive
GitHub now exposes sha256 digests for release assets natively,
meaning that they are pre-computed when publishing and served via
the web UI as well as all of their APIs.
https://github.blog/changelog/2025-06-03-releases-now-expose-digests-for-release-assets/
Signed-off-by: Daniel Martí <mvdan@mvdan.cc>
Change-Id: I15fc57a489b7496554caf935a247c04808a5c0a8
Reviewed-on: https://review.gerrithub.io/c/cue-lang/cue/+/1224463
TryBot-Result: CUEcueckoo <cueckoo@cuelang.org>
Unity-Result: CUE porcuepine <cue.porcuepine@gmail.com>
Reviewed-by: Paul Jolly <paul@myitcv.io>