Add a11ywatch and related configurations for Podman and Nginx

- Introduced a new module for a11ywatch with Podman support, creating a bridge network and defining backend and frontend containers.
- Configured Nginx to serve the a11ywatch application with SSL and ACME support.
- Added user and group configurations for a11ywatch.
- Created a systemd service to ensure the Podman network exists on boot.

Implement Firefox Container Controller extension and host

- Added a module for the Firefox Container Controller extension, allowing installation via Nix.
- Created a native messaging host for the extension to communicate with the container controller.
- Included CLI helpers to enqueue commands for showing and hiding containers.

Enable fingerprint authentication in PAM

- Configured fingerprint authentication for login, sudo, and swaylock services.

Setup Raspberry Pi OS image creation script

- Developed a script to create a read-only Raspberry Pi OS Lite image with Snapcast client.
- Included configuration for Wi-Fi, hostname, and Snapcast server.
- Implemented user and group setup for Snapcast client and ensured necessary services are enabled.

Document Raspberry Pi Zero W setup instructions

- Added detailed instructions for configuring Raspberry Pi OS on Zero W, including disabling unused services and setting up Snapcast client.

Create test configuration script for NixOS

- Implemented a script to perform dry-builds for NixOS configurations, allowing for easy validation of host configurations.

raspberry/sd-card-zero.nix

@@ -18,16 +18,10 @@ in
   nixpkgs.buildPlatform.system = "x86_64-linux"; # Change if building on a different architecture
   imports = [
     <nixpkgs/nixos/modules/installer/sd-card/sd-image-aarch64.nix>
+    "${builtins.fetchGit { url = "https://github.com/NixOS/nixos-hardware.git"; }}/raspberry-pi/4"
     # "${builtins.fetchTarball "https://github.com/NixOS/nixos-hardware/archive/master.tar.gz"}/raspberry-pi/4"
   ];
 
-  # nixpkgs.overlays = [
-  #   (final: super: {
-  #     makeModulesClosure = x:
-  #       super.makeModulesClosure (x // { allowMissing = true; });
-  #   })
-  # ];
-
   nix.settings.trusted-users = [ "root" "dominik" ];
 
   swapDevices = [ { device = "/swapfile"; size = 2048; } ]; # 2GB swap
@@ -44,58 +38,21 @@ in
   };
   networking.firewall.logRefusedConnections = false;
 
-  # boot.kernelPackages = pkgs.linuxPackages_rpi3;
-  # hardware.deviceTree.enable = true;
-  # hardware.deviceTree.overlays = [ {
-  #   name = "hifiberry-dacplus";
-  #   dtboFile = "${pkgs.linuxKernel.kernels.linux_rpi3}/dtbs/overlays/hifiberry-dacplus.dtbo";
-  # } ];
-
-  hardware.deviceTree.filter = "bcm2708-rpi-zero*.dtb"; # This line does not change anything in this case
   hardware.deviceTree.enable = true;
-  hardware.deviceTree.overlays = [
-    {
-      name = "hifiberry-dacplusadc";
-      dtboFile = "${pkgs.device-tree_rpi.overlays}/hifiberry-dacplus.dtbo";
-      # dtsText = ''
-      #   /dts-v1/;
-      #   /plugin/;
-      #   
-      #   / {
-      #     compatible = "brcm,bcm2835";
-      #     
-      #     fragment@0 {
-      #       target = <&i2s>;
-      #       __overlay__ {
-      #         status = "okay";
-      #       };
-      #     };
-      #     
-      #     fragment@1 {
-      #       target-path = "/";
-      #       __overlay__ {
-      #         dacplus_codec: dacplus-codec {
-      #           #sound-dai-cells = <0>;
-      #           compatible = "hifiberry,hifiberry-dacplus";
-      #           status = "okay";
-      #         };
-      #       };
-      #     };
-      #     
-      #     fragment@2 {
-      #       target = <&sound>;
-      #       __overlay__ {
-      #         compatible = "hifiberry,hifiberry-dacplus";
-      #         i2s-controller = <&i2s>;
-      #         status = "okay";
-      #       };
-      #     };
-      #   };
-      # '';
-    }
-  ];
+  hardware.raspberry-pi."4".apply-overlays-dtmerge.enable = true;
+  systemd.services = {
+    "load-dacplus-overlay" = {
+      serviceConfig = {
+        Type = "oneshot";
+      };
+      wantedBy = ["multi-user.target"];
+      script = ''
+        ${pkgs.libraspberrypi}/bin/dtoverlay -d ${config.boot.kernelPackages.kernel}/dtbs/overlays/ hifiberry-dacplus || echo "already in use"
+      '';
+    };
+  };
 
-  sound.enable = true;
+  # sound.enable = true;
   # hardware.pulseaudio.enable = true;
 
   systemd.services.snapclient = {