fixup! Unify the prerelease suffix logic across all scripts and CI

Author: cameel

scripts/prerelease_suffix.sh

@@ -6,6 +6,11 @@ prerelease_source="${1:-nightly}"
 git_tag="${2:-}"
 FORCE_RELEASE="${FORCE_RELEASE:-}"
 
+GNU_DATE="date"
+if [[ "$OSTYPE" == "darwin"* ]]; then
+    GNU_DATE=gdate
+fi
+
 if [[ $FORCE_RELEASE != "" || $git_tag =~ ^v[0-9.]+$ ]]; then
     echo -n
 elif [[ $git_tag =~ ^v[0-9.]+-pre. ]]; then
@@ -19,6 +24,6 @@ else
     # NOTE: git --date is supposed to support the %-m/%-d format too, but it does not seem to
     # work on Windows. Without it we get leading zeros for month and day.
     last_commit_date=$(TZ=UTC git show --quiet --date="format-local:%Y-%m-%d" --format="%cd")
-    last_commit_date_stripped=$(date --date="$last_commit_date" "+%Y.%-m.%-d")
+    last_commit_date_stripped=$("$GNU_DATE" --date "$last_commit_date" "+%Y.%-m.%-d")
     echo -n "${prerelease_source}.${last_commit_date_stripped}"
 fi