Feat: Decide whether to do database migration based on version.lock

pkg/conf/version.go

@@ -0,0 +1,11 @@
+package conf
+
+import "io/ioutil"
+
+const BackendVersion = string("3.0.0-b")
+
+// WriteVersionLock 将当前版本信息写入 version.lock
+func WriteVersionLock() error {
+	err := ioutil.WriteFile("version.lock", []byte(BackendVersion), 0644)
+	return err
+}