Fix dodoc release: use c++ instead of $CXX

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: korenmiklos

.github/workflows/dodoc-release.yml

@@ -45,7 +45,7 @@ jobs:
             CXXFLAGS="$CXXFLAGS -static"
           fi
           mkdir -p build/dodoc
-          $CXX $CXXFLAGS -Isrc/core -o build/dodoc/dodoc src/cli/dodoc.cpp src/core/dodo_core.cpp
+          c++ $CXXFLAGS -Isrc/core -o build/dodoc/dodoc src/cli/dodoc.cpp src/core/dodo_core.cpp
           strip build/dodoc/dodoc || true
 
       - name: Smoke test