enable web search in opencode

devenv.nix

@@ -43,7 +43,16 @@ in
     openbao
     pv-migrate
     mermaid-cli
-    opencode
+    (
+      # Wrapping opencode to set the OPENCODE_ENABLE_EXA environment variable
+      runCommand "opencode" {
+        buildInputs = [ makeWrapper ];
+      } ''
+        mkdir -p $out/bin
+        makeWrapper ${pkgs.opencode}/bin/opencode $out/bin/opencode \
+          --set OPENCODE_ENABLE_EXA "1"
+        ''
+    )
     garm-cli
     tea
   ];