[Armbian build PR] - Suppress RX today error in MOTD if wrong NIC is detected

[RSS Bot]

Description

We are using this: PRIMARY_INTERFACE="$(ls -1 /sys/class/net/ | grep -v lo | egrep "enp|eth" | head -1)" to detect primary interface. Sometimes it doesn't find proper one. This add additional check.

Before:

System load:   5%           Up time:       11 minLocal users:   2            
Memory usage:  14% of 982M   IP:       10.0.30.126
CPU temp:      35°C           Usage of /:    11% of 28G    
RX today:      Error: No interface matching "--oneline" found in database.

After:

System load:   5%           Up time:       15 minLocal users:   2            
Memory usage:  14% of 982M   IP:       10.0.30.126
CPU temp:      34°C           Usage of /:    11% of 28G    
RX today:      62.0 MiB

Jira reference number AR-1450

How Has This Been Tested?

• [ ] Manual test

Checklist:

• [ ] My code follows the style guidelines of this project
• [ ] I have performed a self-review of my own code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [ ] My changes generate no new warnings
• [ ] Any dependent changes have been merged and published in downstream modules

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