Fix retry-docker-build exit code capture after failed build.

Co-authored-by: Cursor <cursoragent@cursor.com>

scripts/retry-docker-build.sh

@@ -16,10 +16,13 @@ fi
 attempt=1
 while true; do
   echo "== docker build attempt ${attempt}/${MAX}: $*"
-  if "$@"; then
+  set +e
+  "$@"
+  code=$?
+  set -e
+  if (( code == 0 )); then
     exit 0
   fi
-  code=$?
   if (( attempt >= MAX )); then
     echo "== all ${MAX} attempts failed (last exit ${code})"
     exit "${code}"