add build-push script

flake.nix

@@ -306,6 +306,7 @@
           # allow using them from other flakes that import this one.
 
           packages = flake-utils.lib.flattenTree {
+            build-push = pkgs.build-push;
             build-system = pkgs.build-system;
             drone-gen = pkgs.drone-gen;
             mtu-check = pkgs.mtu-check;

overlays/default.nix

@@ -9,6 +9,7 @@ self: super: {
   # needed.
 
   anki-bin = super.pkgs.callPackage ../packages/anki-bin { };
+  build-push = super.pkgs.callPackage ../packages/build-push { };
   build-system = super.pkgs.callPackage ../packages/build-system { };
   bukkit-spigot = super.pkgs.callPackage ../packages/bukkit-spigot { };
   darknet = super.pkgs.callPackage ../packages/darknet { };

packages/build-push/default.nix

@@ -0,0 +1,37 @@
+{ stdenv
+, writeShellScriptBin
+, nixFlakes
+, ...
+}:
+let
+
+  # build system script
+  build-push-skript = writeShellScriptBin "build-push" ''
+    # build hosts
+    ${nixFlakes}/bin/nix build ${../../.}#nixosConfigurations.aida.config.system.build.toplevel
+    ${nixFlakes}/bin/nix build ${../../.}#nixosConfigurations.daisy.config.system.build.toplevel
+    ${nixFlakes}/bin/nix build ${../../.}#nixosConfigurations.deke.config.system.build.toplevel
+    ${nixFlakes}/bin/nix build ${../../.}#nixosConfigurations.kora.config.system.build.toplevel
+    ${nixFlakes}/bin/nix build ${../../.}#nixosConfigurations.simmons.config.system.build.toplevel
+    ${nixFlakes}/bin/nix build ${../../.}#nixosConfigurations.snowflake.config.system.build.toplevel
+    ${nixFlakes}/bin/nix build ${../../.}#nixosConfigurations.the-bus.config.system.build.toplevel
+    ${nixFlakes}/bin/nix build ${../../.}#nixosConfigurations.the-hub.config.system.build.toplevel
+
+    # add push to binary cache
+  '';
+
+in
+stdenv.mkDerivation
+{
+
+  pname = "build-push";
+  version = "0.1.0";
+
+  # Needed if no src is used. Alternatively place script in
+  # separate file and include it as src
+  dontUnpack = true;
+
+  installPhase = ''
+    cp -r ${build-push-skript} $out
+  '';
+}