Merge pull request #194644 from the-argus/feat/mkdefault-etc-issue

nixos/modules/services/ttys/getty.nix

···
         enable = mkDefault config.boot.isContainer;
       };
 
-    environment.etc.issue =
+    environment.etc.issue = mkDefault
       { # Friendly greeting on the virtual consoles.
         source = pkgs.writeText "issue" ''