Remove unnecessary chmod from Dockerfile

Files in /shared/ are already executable from host mount,
no need to chmod at build time (which fails anyway since
/shared/ doesn't exist during build).

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/rego-tunnel/build/Dockerfile

@@ -13,6 +13,5 @@ RUN ln -s /shared/supervisord.conf /etc/supervisor/conf.d/supervisord.conf
 RUN ln -s /shared/start-vm.sh /usr/local/bin/start-vm.sh
 RUN ln -s /shared/setup-network.sh /usr/local/bin/setup-network.sh
 RUN ln -s /shared/start-dnsmasq.sh /usr/local/bin/start-dnsmasq.sh
-RUN chmod +x /usr/local/bin/start-vm.sh /usr/local/bin/setup-network.sh /usr/local/bin/start-dnsmasq.sh
 
 CMD ["/usr/bin/supervisord", "-c", "/etc/supervisor/conf.d/supervisord.conf"]