feat(*): expose migrate as a function

src/index.js

@@ -5,6 +5,7 @@ const { send: sendEmail } = require('./services/sendEmail')
 
 const logger = require('./logger')
 const db = require('./dbManager/db')
+const migrate = require('./dbManager/migrate')
 const pubsubManager = require('./graphql/pubsub')
 const authentication = require('./authentication')
 const { File } = require('./models')
@@ -69,6 +70,7 @@ module.exports = {
   File,
   logger,
   db,
+  migrate,
   useTransaction,
 
   cron,