Use tini as Docker Runtime Init to Ensure Zombie Processes Get Reaped (#12133)

Co-authored-by: Tim O'Farrell <tofarr@gmail.com>

openhands/app_server/sandbox/docker_sandbox_service.py

@@ -346,6 +346,9 @@ class DockerSandboxService(SandboxService):
                 working_dir=sandbox_spec.working_dir,
                 labels=labels,
                 detach=True,
+                # Use Docker's tini init process to ensure proper signal handling and reaping of
+                # zombie child processes.
+                init=True,
             )
 
             sandbox_info = await self._container_to_sandbox_info(container)