Add which opencode to start.sh for debugging

Dockerfile

@@ -47,6 +47,7 @@ RUN printf '#!/bin/sh\n\
 echo "Starting OpenCode AI Web Server..."\n\
 echo "Server will be available at http://0.0.0.0:7860 "\n\
 echo "OpenAPI documentation available at http://0.0.0.0:7860/doc "\n\
+which opencode\n\
 exec /usr/local/bin/opencode serve --hostname 0.0.0.0 --port 7860\n\
 ' > /home/opencode/.local/bin/start.sh && \
     chmod +x /home/opencode/.local/bin/start.sh