[edgefunc/runc] Fix error if routing table already exists

Author: dilyevsky

pkg/edgefunc/runc/network/net.go

@@ -11,6 +11,7 @@ import (
 "os"
 "path/filepath"
 goruntime "runtime"
+"syscall"
 
 "github.com/dgraph-io/badger/v4"
 "github.com/metal-stack/go-ipam"
@@ -185,7 +186,7 @@ func (n *Network) Init(ctx context.Context) error {
 IP: net.ParseIP("0.0.0.0"),
 Mask: net.CIDRMask(0, 32),
 }
-if err := netlink.RuleAdd(rule); err != nil {
+if err := netlink.RuleAdd(rule); err != nil && !errors.Is(err, syscall.EEXIST) {
 return fmt.Errorf("failed to add routing rule: %w", err)
 }