From bedf5a83cb0c3327ed824144b0288918471e13cf Mon Sep 17 00:00:00 2001
From: Alexander Amiri <alexander.amiri@piano.io>
Date: Wed, 18 Mar 2026 00:20:08 +0100
Subject: [PATCH] Fix tf-plan: checkout PR head branch, not merge ref

Same fix as expand-terraform (PR #89). When expand pushes regenerated
files to the PR branch, tf-plan must checkout the updated branch HEAD,
not the stale merge ref captured at workflow trigger time.
---
 .github/workflows/tf-plan.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.github/workflows/tf-plan.yml b/.github/workflows/tf-plan.yml
index 484ee54..307b79d 100644
--- a/.github/workflows/tf-plan.yml
+++ b/.github/workflows/tf-plan.yml
@@ -51,7 +51,7 @@ jobs:
 
       - uses: actions/checkout@v6
         with:
-          ref: ${{ github.ref }}
+          ref: ${{ github.head_ref || github.ref }}
 
       - uses: hashicorp/setup-terraform@v4
         with: