Add google signin/signup

back/prisma/migrations/20230621090510_google/migration.sql

@@ -0,0 +1,12 @@
+/*
+  Warnings:
+
+  - A unique constraint covering the columns `[googleID]` on the table `User` will be added. If there are existing duplicate values, this will fail.
+
+*/
+-- AlterTable
+ALTER TABLE "User" ADD COLUMN     "googleID" TEXT,
+ALTER COLUMN "password" DROP NOT NULL;
+
+-- CreateIndex
+CREATE UNIQUE INDEX "User_googleID_key" ON "User"("googleID");

back/prisma/schema.prisma

@@ -12,8 +12,9 @@ datasource db {
 model User {
     id            Int             @id @default(autoincrement())
     username      String          @unique
-    password      String
+    password      String?
     email         String
+    googleID      String?         @unique
     isGuest       Boolean         @default(false)
     partyPlayed   Int             @default(0)
     LessonHistory LessonHistory[]