sourcehut: disable IPv6 completely for tests

Signed-off-by: Christoph Heiss <christoph@c8h4.io>

Changed files
+1
nixos
+1
nixos/tests/sourcehut.nix
···
virtualisation.diskSize = 4 * 1024;
virtualisation.memorySize = 2 * 1024;
networking.domain = domain;
+
networking.enableIPv6 = false;
networking.extraHosts = ''
${config.networking.primaryIPAddress} builds.${domain}
${config.networking.primaryIPAddress} git.${domain}