From 346b693bc742bb6292d355b1fe0d786102cece70 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Christopher=20M=C3=BChl?= <toki@toph.so>
Date: Wed, 4 Mar 2026 12:20:47 +0100
Subject: [PATCH] fix: use single-user Nix builds in docker-build-nix

Set build-users-group to empty to disable multi-user builds,
which require nixbld group and build users. This allows the
action to work in single-user Nix environments like containers.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
---
 docker-build-nix/action.yaml | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/docker-build-nix/action.yaml b/docker-build-nix/action.yaml
index 1c7096f..04de7c8 100644
--- a/docker-build-nix/action.yaml
+++ b/docker-build-nix/action.yaml
@@ -50,6 +50,9 @@ runs:
         experimental-features = nix-command flakes
         extra-substituters = https://cache.nixos.org/ ${{ inputs.attic-endpoint }}/ci ${{ inputs.attic-endpoint }}/toph
         extra-trusted-public-keys = cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY= ci:db8ZBxd5cjqoGzOYThRQcxj4XnaqHJZBZw1phCQOiz8= toph:E/oP7KyljH/yprI5LArxNPpSlQCdo29sMOkh3jm53Yg=
+        build-users-group =
+        max-jobs = auto
+        cores = 0
         EOF
 
     - name: Build OCI image with Nix