ci nix: temporarily(?) avoid issues

diff --git a/ci/pkgtest.yaml b/ci/pkgtest.yaml
index 6efcc0271914269f86c28b77ba9f0d3d4519157a..9525b0776106299ba8ebcf35b3dadd9e1ba6fd70 100644 (file)
--- a/ci/pkgtest.yaml
+++ b/ci/pkgtest.yaml
@@ -147,7 +147,8 @@ nixos-unstable:pkgbuild:
     - docker
     - linux
     - amd64
-  image: nixos/nix
+  # TODO: untag after resolving problems around https://github.com/NixOS/nix/issues/5776
+  image: nixos/nix:2.3.12
 
   variables:
     #NIX_PATH: nixpkgs=https://github.com/nixos/nixpkgs/archive/nixos-unstable.tar.gz