From 7645ef1602ba0d71d6fd95907fbea3d699acc95c Mon Sep 17 00:00:00 2001
From: Oliver Ni <oliverni@berkeley.edu>
Date: Sun, 22 Sep 2024 19:48:26 -0700
Subject: [PATCH] fix define-matrix output

---
 .github/workflows/build.yaml | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/.github/workflows/build.yaml b/.github/workflows/build.yaml
index 3bc9a2d..503d9e3 100644
--- a/.github/workflows/build.yaml
+++ b/.github/workflows/build.yaml
@@ -13,7 +13,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - run: echo "hosts=" && ls hosts | sed -n 's/\.nix$//p' | jq -R | jq -s >> "$GITHUB_OUTPUT"
+      - run: |
+          echo -n "hosts=" >> "$GITHUB_OUTPUT"
+          ls hosts | sed -n 's/\.nix$//p' | jq -R | jq -s >> "$GITHUB_OUTPUT"
 
   build:
     runs-on: ubuntu-latest