I just installed vaultwarden using installation guide from github.
docker pull vaultwarden/server:latest
docker run -d --name vaultwarden -v /vw-data/:/data/ --restart unless-stopped -p 80:80 vaultwarden/server:latest
When accessing /admin The admin panel is disabled, please configure the 'ADMIN_TOKEN' variable to enable it
So how to configure ADMIN_TOKEN on running vaultwarden docker instance