feat: adding the asahi configuration

hosts/asahi/apple-silicon-support/packages/asahi-audio/default.nix

@@ -0,0 +1,37 @@
+{ stdenv
+, lib
+, fetchFromGitHub
+}:
+
+stdenv.mkDerivation rec {
+  pname = "asahi-audio";
+  # tracking: https://src.fedoraproject.org/rpms/asahi-audio
+  version = "2.5";
+
+  src = fetchFromGitHub {
+    owner = "AsahiLinux";
+    repo = "asahi-audio";
+    rev = "v${version}";
+    hash = "sha256-u+Ef2vA/EQ3b5wsCNPOGEPUk/Vah0mS71gDVhCLBq+g=";
+  };
+
+  preBuild = ''
+    export PREFIX=$out
+
+    readarray -t configs < <(\
+          find . \
+                -name '*.conf' -or \
+                -name '*.json' -or \
+                -name '*.lua'
+    )
+
+    substituteInPlace "''${configs[@]}" --replace \
+          "/usr/share/asahi-audio" \
+          "$out/asahi-audio"
+  '';
+
+  postInstall = ''
+    # no need to link the asahi-audio dir globally
+    mv $out/share/asahi-audio $out
+  '';
+}