Remove code to prefetch Docker images

modules/k3s/default.nix

@@ -1,4 +1,4 @@
-{ self, inputs, pkgs, lib, config, globals, ... }:
+{ self, inputs, pkgs, lib, config, ... }:
 let
   cfg = config.lab.k3s;
 in
@@ -191,48 +191,6 @@ in
             '';
           }
         );
-
-      docker-images.text =
-        let
-          imageDefs = import "${self}/container-images.nix";
-
-          setupCommands = [
-            "rm -rf ${self.globals.imageDir}"
-            "mkdir -p ${self.globals.imageDir}"
-          ];
-
-          getDockerImageConfig = dockerImage:
-            let
-              configJson = pkgs.runCommand "config.json"
-                {
-                  nativeBuildInputs = [ pkgs.skopeo pkgs.jq ];
-                }
-                ''
-                  skopeo --tmpdir $TMPDIR --insecure-policy inspect docker-archive:${dockerImage} --config | jq '.config' > $out
-                '';
-            in
-            builtins.fromJSON (builtins.readFile configJson);
-
-          imageDefToLinkCommand = name: imageDef:
-            let
-              dockerImage = pkgs.dockerTools.pullImage imageDef;
-              nixSnapshotterImage = pkgs.nix-snapshotter.buildImage {
-                inherit name;
-                resolvedByNix = true;
-                fromImage = dockerImage;
-                config = getDockerImageConfig dockerImage;
-              };
-              imageLinkPath = "${self.globals.imageDir}/${name}.tar";
-            in
-            "ln -sf ${nixSnapshotterImage} ${imageLinkPath}";
-
-          linkCommandList = lib.attrsets.mapAttrsToList imageDefToLinkCommand imageDefs;
-          # TODO: Creating Docker images like this seems to *explode* in size.
-          # Doing this for every image we currently have is infeasible.
-          # I should investigate why the size increases like that.
-          commandList = setupCommands; # ++ linkCommandList;
-        in
-        builtins.concatStringsSep "\n" commandList;
     };
 
     sops.secrets =