feat: add --add-host flag to customize host-to-IP mapping in /etc/hosts

Signed-off-by: Adphi <philippe.adrien.nousse@gmail.com>

convert_options.go

@@ -38,6 +38,7 @@ type convertOptions struct {
 	hostname  string
 	dns       []string
 	dnsSearch []string
+	hosts     map[string]string
 }
 
 func (o *convertOptions) hasGrubBIOS() bool {
@@ -149,3 +150,9 @@ func WithDNSSearch(dnsSearch []string) ConvertOption {
 		o.dnsSearch = dnsSearch
 	}
 }
+
+func WithExtraHosts(hosts map[string]string) ConvertOption {
+	return func(o *convertOptions) {
+		o.hosts = hosts
+	}
+}