diff --git a/.gitea/workflows/test-build.yml b/.gitea/workflows/test-build.yml
index 86f96c3..dd0aea6 100644
--- a/.gitea/workflows/test-build.yml
+++ b/.gitea/workflows/test-build.yml
@@ -12,6 +12,8 @@ jobs:
         run: |
           apt update && apt install -y sudo zstd
           echo "USER=$(whoami)" >> $GITHUB_ENV
+          groupadd -r nixbld
+          for n in $(seq 1 10); do useradd -c "Nix build user $n" -d /var/empty -g nixbld -G nixbld -M -N -r -s "$(command -v nologin)" "nixbld$n"; done
 
       - name: Install Nix
         uses: https://github.com/nixbuild/nix-quick-install-action@v25