Assign EIP only to primary ENI

[antonipp]

This is a quickfix for the issue which caused secondary ENIs to be assigned Public IPs

The main issue was that there was no check on eni.Number == 0 before assignment.

Another issue was that with first-interface-index: 1, the IPAM reconciliation loop was exiting here for the primary ENI:

cilium/pkg/aws/eni/node.go

Line 639 in 123b048

return nil

so it was never saving the Public IP:

cilium/pkg/aws/eni/node.go

Lines 653 to 656 in 123b048

	// If the primary ENI has a public IP, we store it
	if e.Number == 0 && e.PublicIP != "" {
	stats.AssignedStaticIP = e.PublicIP
	}

. It didn't really impact functionality but cased infinite retries to assign a new Public IP. I just moved the Public IP check further up, before the index check.