[questions][chore] add default upovte value

apps/portal/prisma/migrations/20221024123849_add_upvotes_default_value/migration.sql

@@ -0,0 +1,2 @@
+-- AlterTable
+ALTER TABLE "QuestionsAnswerComment" ALTER COLUMN "upvotes" SET DEFAULT 0;

apps/portal/prisma/schema.prisma

@@ -512,7 +512,7 @@ model QuestionsAnswerComment {
   answerId  String
   userId    String?
   content   String   @db.Text
-  upvotes   Int
+  upvotes   Int      @default(0)
   createdAt DateTime @default(now())
   updatedAt DateTime @updatedAt