Add JWT secret to next-auth.js (#730)

.env.example

@@ -5,6 +5,8 @@ GOOGLE_API_CREDENTIALS='secret'
 BASE_URL='http://localhost:3000'
 NEXT_PUBLIC_APP_URL='http://localhost:3000'
 
+JWT_SECRET='secret'
+
 # @see: https://github.com/calendso/calendso/issues/263
 # Required for Vercel hosting - set NEXTAUTH_URL to equal your BASE_URL
 # NEXTAUTH_URL='http://localhost:3000'

pages/api/auth/[...nextauth].tsx

@@ -10,6 +10,9 @@ export default NextAuth({
   session: {
     jwt: true,
   },
+  jwt: {
+    secret: process.env.JWT_SECRET,
+  },
   pages: {
     signIn: "/auth/login",
     signOut: "/auth/logout",