rerun: support web_viewer feature

When web_viewer is compiled, the wasm webviewer first needs to be built
If this doesn't exist, the build will fail. More information: rerun-io/rerun#6028
The command is taken from https://github.com/rerun-io/rerun/blob/dd025f1384f9944d785d0fb75ca4ca1cd1792f17/pixi.toml#L198C72-L198C187
Note that cargoBuildFeatures reference what buildFeatures is set to in stdenv.mkDerivation,
so that user can easily create an overlay to set cargoBuildFeatures to what he needs

pkgs/by-name/re/rerun/package.nix

@@ -49,7 +49,25 @@ rustPlatform.buildRustPackage rec {
   cargoBuildFlags = [ "--package rerun-cli" ];
   cargoTestFlags = [ "--package rerun-cli" ];
   buildNoDefaultFeatures = true;
-  buildFeatures = [ "native_viewer" ];
+  buildFeatures = [ "native_viewer" "web_viewer" ];
+
+  # When web_viewer is compiled, the wasm webviewer first needs to be built
+  # If this doesn't exist, the build will fail. More information: https://github.com/rerun-io/rerun/issues/6028
+  # The command is taken from https://github.com/rerun-io/rerun/blob/dd025f1384f9944d785d0fb75ca4ca1cd1792f17/pixi.toml#L198C72-L198C187
+  # Note that cargoBuildFeatures reference what buildFeatures is set to in stdenv.mkDerivation,
+  # so that user can easily create an overlay to set cargoBuildFeatures to what he needs
+  configurePhase = ''
+    runHook preConfigure
+
+    if [[ " $cargoBuildFeatures " == *" web_viewer "* ]]; then
+      echo "Building with web_viewer feature..."
+      cargo run -p re_dev_tools -- build-web-viewer --no-default-features --features analytics,grpc,map_view --release -g
+    else
+      echo "web_viewer feature not enabled, skipping web viewer build."
+    fi
+
+    runHook postConfigure
+  '';
 
   nativeBuildInputs = [
     (lib.getBin binaryen) # wasm-opt