From e739e3cadb78386115c46322de60a4f81c740db2 Mon Sep 17 00:00:00 2001
From: "Zaiming (Stone) Shi" <zmstone@gmail.com>
Date: Fri, 5 May 2023 21:49:15 +0200
Subject: [PATCH] ci: ensure == compare is not empty on the left

---
 .github/workflows/build_packages.yaml | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/.github/workflows/build_packages.yaml b/.github/workflows/build_packages.yaml
index 64c48f1cb..99c930430 100644
--- a/.github/workflows/build_packages.yaml
+++ b/.github/workflows/build_packages.yaml
@@ -270,7 +270,8 @@ jobs:
         echo "pwd is $PWD"
         PKGTYPES="tgz pkg"
         IS_ELIXIR="no"
-        if [ ${{ matrix.release_with }} == 'elixir' ]; then
+        WITH_ELIXIR=${{ matrix.release_with }}
+        if [ "${WITH_ELIXIR:-}" == 'elixir' ]; then
           PKGTYPES="tgz"
           # set Elixir build flag
           IS_ELIXIR="yes"