Fix colours on console when logging to file (#1846)

* Fix colours on console when logging to file

pkg/logger/hook.go

@@ -0,0 +1,25 @@
+package logger
+
+import (
+	"io"
+
+	"github.com/sirupsen/logrus"
+)
+
+type fileLogHook struct {
+	Writer    io.Writer
+	Formatter logrus.Formatter
+}
+
+func (hook *fileLogHook) Fire(entry *logrus.Entry) error {
+	line, err := hook.Formatter.Format(entry)
+	if err != nil {
+		return err
+	}
+	_, err = hook.Writer.Write(line)
+	return err
+}
+
+func (hook *fileLogHook) Levels() []logrus.Level {
+	return logrus.AllLevels
+}