Rename namespace to docker.tools

I have tested this version in the datoms project.

flake.nix

@@ -11,22 +11,41 @@
     flake-utils.lib.eachDefaultSystem (system:
       let
         pkgs = import nixpkgs { inherit system; };
+
       in
       {
         devShells.default = pkgs.mkShell {
           packages = with pkgs; [ go gotools golangci-lint gopls gopkgs go-outline ];
         };
-        packages = {
+        packages = rec {
           default = pkgs.buildGoModule {
             pname = "babashka-pod-docker";
             version = "0.0.1";
             src = ./.;
-            vendorSha256 = "sha256-KUWqddPcv+hLStd7JEzQBUiGLPLYwfmyVoG1BtaHWXY=";
-            postInstall = ''
-              	        mv $out/bin/parser $out/bin/babashka-pod-docker
-              	        '';
-
+	    # uncomment this and re-run to find the new vendor sha when module deps change
+	    #   note that you'll get inconsistent vendor deps if this gets out of sync because
+	    #   this sha defines the input for the mod deps derivation
+            # vendorSha256 = nixpkgs.lib.fakeSha256;
+	    vendorSha256 = "sha256-jCjNhi0eqEBNPts/xmbwugs0T6HUw1ESip/li4/J6YY=";
+	    CGO_ENABLED = 0;
           };
+
+  	  docker = pkgs.dockerTools.buildImage {
+	    name = "docker-pod";
+	    tag = "latest";
+	    config = {
+	      Cmd = ["${default}/bin/babashka-pod-docker"];
+	    };
+	  };
+
+	  default-linux = default.overrideAttrs (old: old // {GOOS = "linux"; GOARCH = "arm64";});
+	  docker-arm64 = pkgs.dockerTools.buildImage {
+	    name = "docker-pod";
+	    tag = "latest";
+	    config = {
+	      Cmd = ["${default-linux}/bin/linux_arm64/babashka-pod-docker"];
+	    };
+	  };
         };
       });
 }