feat: added temporary overlay for opencode until fix pr is in unstable

overlays/opencode/default.nix

@@ -0,0 +1,34 @@
+# HACK: temporary fix until fix pr is merged in (https://nixpk.gs/pr-tracker.html?pr=440598)
+{...}: final: prev: {
+  opencode = prev.opencode.overrideAttrs (oldAttrs: let
+    version = "0.6.4";
+    src = final.fetchFromGitHub {
+      owner = "sst";
+      repo = "opencode";
+      rev = "v${version}";
+      hash = "sha256-o7SzDGbWgCh8cMNK+PeLxAw0bQMKFouHdedUslpA6gw=";
+    };
+
+    tui = oldAttrs.tui.overrideAttrs (_: {
+      inherit src version;
+      vendorHash = "sha256-8pwVQVraLSE1DRL6IFMlQ/y8HQ8464N/QwAS8Faloq4=";
+    });
+  in {
+    inherit version src tui;
+
+    buildPhase = ''
+      runHook preBuild
+
+      bun build \
+        --define OPENCODE_TUI_PATH="'${tui}/bin/tui'" \
+        --define OPENCODE_VERSION="'${version}'" \
+        --compile \
+        --compile-exec-argv="--" \
+        --target=bun-${final.system} \
+        --outfile=opencode \
+        ./packages/opencode/src/index.ts \
+
+      runHook postBuild
+    '';
+  });
+}