add apollo firmware to cynthion package

pkgs/cynthion/gateware.nix

@@ -0,0 +1,39 @@
+{
+  stdenvNoCC,
+  cynthion-unwrapped,
+  zsh,
+  yosys,
+  nextpnr,
+  trellis,
+  ...
+}:
+stdenvNoCC.mkDerivation {
+  pname = "cynthion-gateware";
+  inherit (cynthion-unwrapped) version src;
+  dontFixup = true;
+
+  nativeBuildInputs = [
+    cynthion-unwrapped
+    yosys
+    nextpnr
+    trellis
+    zsh
+  ];
+
+  preBuild = ''
+    cd cynthion/python
+  '';
+
+  buildPhase = ''
+    runHook preBuild
+
+    make -j $NIX_BUILD_CORES SHELL=zsh bitstreams
+
+    runHook postBuild
+  '';
+
+  installPhase = ''
+    mkdir -p $out/share
+    cp -r assets $out/share
+  '';
+}