feat: add backend_v1 migration

backend_v1/pkg/utils/buffer.go

@@ -0,0 +1,26 @@
+package utils
+
+import (
+	"bufio"
+	"io"
+)
+
+// NewLogBuffer creates a buffer that can be used to capture output stream
+// and write to a logger in real time
+func NewLogBuffer(output func(string)) io.Writer {
+	reader, writer := io.Pipe()
+
+	go func() {
+		scanner := bufio.NewScanner(reader)
+		for scanner.Scan() {
+			output(scanner.Text())
+		}
+	}()
+
+	return writer
+}
+
+// NewCombinedBuffer combines multiple io.Writers
+func NewCombinedBuffer(writers ...io.Writer) io.Writer {
+	return io.MultiWriter(writers...)
+}