podman: drop slirp4netns which has been replaced by passt (#313670)

nixos/modules/virtualisation/podman/default.nix

@@ -5,12 +5,16 @@ let
 
   inherit (lib) mkOption types;
 
-  podmanPackage = (pkgs.podman.override {
+  podmanPackage = pkgs.podman.override {
     extraPackages = cfg.extraPackages
       # setuid shadow
       ++ [ "/run/wrappers" ]
       ++ lib.optional (config.boot.supportedFilesystems.zfs or false) config.boot.zfs.package;
-  });
+    extraRuntimes = [ pkgs.runc ]
+      ++ lib.optionals (config.virtualisation.containers.containersConf.settings.network.default_rootless_network_cmd or "" == "slirp4netns") (with pkgs; [
+      slirp4netns
+    ]);
+  };
 
   # Provides a fake "docker" binary mapping to podman
   dockerCompat = pkgs.runCommand "${podmanPackage.pname}-docker-compat-${podmanPackage.version}"

pkgs/applications/virtualization/podman/default.nix

@@ -23,7 +23,6 @@
 , runc
 , conmon
 , extraRuntimes ? lib.optionals stdenv.isLinux [ runc ]  # e.g.: runc, gvisor, youki
-, slirp4netns
 , fuse-overlayfs
 , util-linux
 , iptables
@@ -59,7 +58,6 @@ let
       aardvark-dns
       catatonit # added here for the pause image and also set in `containersConf` for `init_path`
       netavark
-      slirp4netns
       passt
       conmon
       crun