Fix a bug when running on an operating system without "bash." (#29131)

* Fix a bug when running on an operating system without "bash."

* add execution condition

* for ci-coverage

paddle/fluid/framework/io/shell.cc

@@ -133,7 +133,12 @@ static int shell_popen_fork_internal(const char* real_cmd, bool do_read,
   }
 
   close_open_fds_internal();
+
+#if defined(PADDLE_WITH_MUSL)
+  PCHECK(execl("/bin/sh", "sh", "-c", real_cmd, NULL) >= 0);
+#else
   PCHECK(execl("/bin/bash", "bash", "-c", real_cmd, NULL) >= 0);
+#endif
   // Note: just for compilation. the child don't run this line.
   _exit(0);
 #endif