Make use of internal docker networks unifi database name

.env.example

@@ -1,4 +1,4 @@
-# Set this value to 'agree' to accept our license: 
+# Set this value to 'agree' to accept our license:
 # LICENSE: https://github.com/calendso/calendso/blob/main/LICENSE
 #
 # Summary of terms:
@@ -14,7 +14,7 @@ NEXT_PUBLIC_APP_URL=http://localhost:3000
 POSTGRES_USER=unicorn_user
 POSTGRES_PASSWORD=magical_password
 POSTGRES_DB=calendso
-DATABASE_HOST=db:5432
+DATABASE_HOST=database:5432
 DATABASE_URL=postgresql://${POSTGRES_USER}:${POSTGRES_PASSWORD}@${DATABASE_HOST}/${POSTGRES_DB}
 GOOGLE_API_CREDENTIALS={}