Fix race condition in CrashGroup::find_or_create by using constraint and upsert (for pg > 9.5) or table lock
<tr>
%= t td => 'Build Architecture'
%= t td => $system_info->{cpu_arch}
</tr>
<tr>
%= t td => 'Build Architecture Info'
%= t td => $system_info->{cpu_info}
</tr>
<tr>
%= t td => 'OS'
%= t td => $system_info->{os}
</tr>
<tr>
%= t td => 'OS Version'
%= t td => $system_info->{os_ver}
</tr>