diff --git a/README.md b/README.md
index 634007f..5336de8 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,8 @@
 * `nix build '.#flakes-action' #for default platform 
 * nix build '#packages.aarch64-linux.flakes-action' #for specific platform
-* `docker load < result`
-* `docker tag [image id] git.cyplo.dev/cyplo/base-images/flakes-action:latest`
-* `docker push git.cyplo.dev/cyplo/base-images/flakes-action:latest`
-
+* 
+```
+export BASE_IMAGE_DOCKER_TAG=`docker load < result | grep -i 'loaded image' | cut -f3 -d ' '`
+docker tag $BASE_IMAGE_DOCKER_TAG git.cyplo.dev/cyplo/base-images/flakes-action:latest
+docker push git.cyplo.dev/cyplo/base-images/flakes-action:latest
+```
diff --git a/flake.nix b/flake.nix
index 1bf89a6..cb90621 100644
--- a/flake.nix
+++ b/flake.nix
@@ -6,90 +6,89 @@
     flake-utils.url = "github:numtide/flake-utils";
   };
 
-  outputs = { self, nixpkgs, flake-utils }:
+  outputs = {
+    self,
+    nixpkgs,
+    flake-utils,
+  }:
     flake-utils.lib.eachDefaultSystem
-      (system:
-        let
-          pkgs = import nixpkgs { inherit system; };
-          pkgsStatic = pkgs.pkgsStatic;
-          lib = pkgs.lib;
-
-        in
-        {
-          packages = {
-            hello = pkgs.dockerTools.buildImage {
-              name = "hello-docker";
-              config = {
-                Cmd = [ "${pkgs.hello}/bin/hello" ];
-              };
-            };
-            flakes-action = pkgs.dockerTools.buildImageWithNixDb {
-              name = "flakes-action";
-              contents = with pkgs; [
-                ./root
-                bash
-                coreutils
-                curl
-                gawk
-                gitFull
-                git-lfs
-                gnused
-                nodejs
-                wget
-                sudo
-                nixFlakes
-                cacert
-                gnutar
-                gzip
-                openssh
-                xz
-                (pkgs.writeTextFile {
-                  name = "nix.conf";
-                  destination = "/etc/nix/nix.conf";
-                  text = ''
-                    accept-flake-config = true
-                    experimental-features = nix-command flakes
-                  '';
-                })
-              ];
-
-              extraCommands = ''
-                # for /usr/bin/env
-                mkdir usr
-                ln -s ../bin usr/bin
-
-                # make sure /tmp exists
-                mkdir -m 1777 tmp
-
-                # need a HOME
-                mkdir -vp root
+    (system: let
+      pkgs = import nixpkgs {inherit system;};
+      pkgsStatic = pkgs.pkgsStatic;
+      lib = pkgs.lib;
+    in {
+      packages = {
+        hello = pkgs.dockerTools.buildImage {
+          name = "hello-docker";
+          config = {
+            Cmd = ["${pkgs.hello}/bin/hello"];
+          };
+        };
+        flakes-action = pkgs.dockerTools.buildImageWithNixDb {
+          name = "flakes-action";
+          contents = with pkgs; [
+            ./root
+            bash
+            cacert
+            coreutils
+            curl
+            gawk
+            gitFull
+            git-lfs
+            gnused
+            gnutar
+            gzip
+            nixFlakes
+            nodejs
+            openssh
+            sudo
+            wget
+            xz
+            zstd
+            (pkgs.writeTextFile {
+              name = "nix.conf";
+              destination = "/etc/nix/nix.conf";
+              text = ''
+                accept-flake-config = true
+                experimental-features = nix-command flakes
               '';
-              config = {
-                Cmd = [ "/bin/bash" ];
-                Env = [
-                  "LANG=en_GB.UTF-8"
-                  "ENV=/etc/profile.d/nix.sh"
-                  "BASH_ENV=/etc/profile.d/nix.sh"
-                  "NIX_BUILD_SHELL=/bin/bash"
-                  "NIX_PATH=nixpkgs=${./fake_nixpkgs}"
-                  "PAGER=cat"
-                  "PATH=/usr/bin:/bin"
-                  "SSL_CERT_FILE=${pkgs.cacert}/etc/ssl/certs/ca-bundle.crt"
-                  "USER=root"
-                ];
-              };
-            };
-          };
+            })
+          ];
 
-          devShells = {
-            default = (pkgs.mkShell {
-              buildInputs = (with pkgs;
-                [
-                  git-lfs
-                ]);
+          extraCommands = ''
+            # for /usr/bin/env
+            mkdir usr
+            ln -s ../bin usr/bin
 
-            });
+            # make sure /tmp exists
+            mkdir -m 1777 tmp
+
+            # need a HOME
+            mkdir -vp root
+          '';
+          config = {
+            Cmd = ["/bin/bash"];
+            Env = [
+              "LANG=en_GB.UTF-8"
+              "ENV=/etc/profile.d/nix.sh"
+              "BASH_ENV=/etc/profile.d/nix.sh"
+              "NIX_BUILD_SHELL=/bin/bash"
+              "NIX_PATH=nixpkgs=${./fake_nixpkgs}"
+              "PAGER=cat"
+              "PATH=/usr/bin:/bin"
+              "SSL_CERT_FILE=${pkgs.cacert}/etc/ssl/certs/ca-bundle.crt"
+              "USER=root"
+            ];
           };
-        });
+        };
+      };
+
+      devShells = {
+        default = pkgs.mkShell {
+          buildInputs = with pkgs; [
+            git-lfs
+          ];
+        };
+      };
+    });
 }
-