Changed

• useHostStore now uses an image derived from the image.* options. You may
  need to enable enableRecommendedContents because with this change, files
  like /bin/sh aren't added by default anymore.

• Drop obsolete NixOS 19.03, 19.09 and 20.03 from CI.

Added

• NixOS-based containers can now run on Podman when it is configured to provide a docker socket. See the installation docs.

• Support service.dns, for overriding the DNS servers used by containers.

• Support service.labels, which is useful for autodiscovery among other things.

• Add a tested example for Traefik with label-based routing.

• Add a flake.nix and an experimental flake example

• Add a warning when systemd DynamicUser is used but not available to the
  container.

• CI with NixOS 21.05