chore: import upstream snapshot with attribution

.github/scripts/is_release.sh

@@ -0,0 +1,9 @@
+#!/bin/sh
+
+# This script checks if the current commit contains changesets.
+
+set -eu
+
+CHANGES=$(node -e "require('@changesets/read').default(process.cwd()).then(result => console.log(!!result.length))")
+
+echo "${CHANGES}"