add session stategy option and secret val

Author: scape76

src/app/api/auth/[...nextauth]/route.ts

@@ -5,6 +5,10 @@ import GithubProvider from "next-auth/providers/github";
 
 export const nextAuthOptions = {
   adapter: PrismaAdapter(prisma),
+  session: {
+    strategy: 'jwt',
+  },
+  secret: process.env.NEXTAUTH_SECRET!,
   providers: [
     GithubProvider({
       clientId: process.env.GITHUB_CLIENT_ID!,