From 318db31b94859cda3b63169b5f6f329cbb653c9c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Christopher=20M=C3=BChl?= <toki@toph.so>
Date: Wed, 4 Mar 2026 15:02:02 +0100
Subject: [PATCH] fix: set TMPDIR for skopeo to writable location

---
 docker-build-nix/action.yaml | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/docker-build-nix/action.yaml b/docker-build-nix/action.yaml
index e12a787..fe936d0 100644
--- a/docker-build-nix/action.yaml
+++ b/docker-build-nix/action.yaml
@@ -87,6 +87,10 @@ runs:
         TARGET_IMAGE="docker://${{ inputs.registry }}/${{ inputs.image-name }}:${{ inputs.image-tag }}"
         echo "Pushing OCI image to: $TARGET_IMAGE"
 
+        # Set TMPDIR to a writable location
+        export TMPDIR="${TMPDIR:-$PWD/tmp}"
+        mkdir -p "$TMPDIR"
+
         # Build skopeo command with optional credentials
         SKOPEO_CMD="skopeo copy"
         if [ -n "${{ inputs.registry-username }}" ] && [ -n "${{ inputs.registry-password }}" ]; then