miniseq flowcell setup sometimes fails

Sentry Issue: [PIPES-3](https://sentry.io/organizations/altius-institute/issues/1520931494/?referrer=github_integration)

```
BashError: command read -d '' unaligned_command  <<_U_ exited with status 1
  File "/home/solexa/stampipes/scripts/flowcells/setup.sh", line 317, in main
    read -d '' unaligned_command  << _U_
```