syslog filter could take several filters

internal/config/custom.go

@@ -1,9 +1,27 @@
 package config
 
 import (
+	"fmt"
 	"net/url"
 )
 
+// StringArray is a custom type for handling multiple string values in flags.
+type StringArray struct {
+	Array *[]string
+}
+
+// String returns a string representation of the StringArray.
+func (i *StringArray) String() string {
+	return fmt.Sprintf("%v", i.Array)
+}
+
+// Set appends a new string value to the StringArray.
+func (i *StringArray) Set(value string) error {
+	*i.Array = append(*i.Array, value)
+
+	return nil
+}
+
 type URL struct {
 	URL *url.URL
 }