buck2: fix selection logic in update.sh

Didn't test this as well as I thought, I guess. Previously it would
return more than one result in the wrong order. Fixed now, so the latest
version is always picked up correctly.

Signed-off-by: Austin Seipp <aseipp@pobox.com>

pkgs/development/tools/build-managers/buck2/hashes.json

@@ -1,5 +0,0 @@
-{ "x86_64-linux": "sha256-dVOshrjpsFomstnJsZMPBDfakXOkU+ORbv//fq8Oxss="
-, "x86_64-darwin": "sha256-BuzA8irlqLWnv5fGUdIHu0grz9smTBdOs5yTUBZLUKg="
-, "aarch64-linux": "sha256-Thr9RsI7AkumBeraq08KoxDAXYKv63bZUTrTYN0GAss="
-, "aarch64-darwin": "sha256-vRu0ra6YN7+o1AId6+v0ZLQucO84KwS3Ila6Ksmp1J0="
-}

pkgs/development/tools/build-managers/buck2/update.sh

@@ -4,10 +4,11 @@
 set -euo pipefail
 
 VERSION=$(curl -s https://api.github.com/repos/facebook/buck2/releases \
-  | jq -r '. |
-           sort_by(.created_at) | .[] |
-           select ((.prerelease == true) and (.name != "latest")) |
-           .name')
+  | jq -r 'sort_by(.created_at) | reverse |
+           (map
+             (select ((.prerelease == true) and (.name != "latest"))) |
+             first
+           ) | .name')
 echo "Latest buck2 prerelease: $VERSION"
 
 ARCHS=(