initial attempt for declarative proton-ge

overlays/proton-ge.nix

@@ -0,0 +1,15 @@
+# Adapted from:
+# https://github.com/Shawn8901/nix-configuration/blob/182a45a6b193143ff7ff8e78bb66f7b869ea48d4/packages/proton-ge-custom/default.nix
+# Based on: https://github.com/NixOS/nixpkgs/issues/73323
+
+inputs: _final: prev: {
+  proton-ge-custom = prev.stdenv.mkDerivation (finalAttrs: rec {
+    name = "proton-ge-custom";
+    version = "0.1"; # Made up
+    src = inputs.proton-ge;
+    installPhase = ''
+      mkdir -p $out/bin
+      cp -r ${src}/* -t $out/bin/
+    '';
+  });
+}