Add base docker image

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

packages/default.nix

@@ -0,0 +1,4 @@
+{ pkgs, ... }:
+{
+  docker-image-base = import ./docker/base { inherit pkgs; };
+}

packages/docker/base/default.nix

@@ -0,0 +1,27 @@
+{ pkgs, ... }:
+pkgs.dockerTools.buildImage {
+  name = "base";
+
+  copyToRoot = pkgs.buildEnv {
+    name = "root";
+    paths = with pkgs; [
+      dockerTools.usrBinEnv
+      dockerTools.binSh
+      dockerTools.caCertificates
+      bashInteractive
+      busybox
+    ];
+    pathsToLink = [
+      "/bin"
+      "/lib"
+      "/share"
+      "/etc"
+      "/usr"
+    ];
+  };
+
+  runAsRoot = ''
+    ${pkgs.dockerTools.shadowSetup}
+    mkdir -p /tmp
+  '';
+}