feat: add desktop entry and icons to postInstall

package.nix

@@ -55,6 +55,15 @@ rustPlatform.buildRustPackage rec {
   # Use the system openssl (from buildInputs) rather than vendoring it.
   OPENSSL_NO_VENDOR = 1;
 
+  postInstall = ''
+    install -Dm644 resources/oryxis.desktop $out/share/applications/oryxis.desktop
+    install -Dm644 resources/logo.svg $out/share/icons/hicolor/scalable/apps/oryxis.svg
+    for size in 64 128 256; do
+      install -Dm644 resources/logo_$size.png \
+        $out/share/icons/hicolor/''${size}x''${size}/apps/oryxis.png
+    done
+  '';
+
   postFixup = ''
     for bin in $out/bin/*; do
       wrapProgram "$bin" \