Server at https://live.mozillamessaging.com will update when the prod
branch is pushed immediately via github webhook.
master
branch commits only update stage, which can be found at https://live-stage.thunderbird.net
You can always check what commit hash is live by checking either: https://live.thunderbird.net/version.txt or https://live-stage.thunderbird.net/version.txt
For the live site, Cloudflare caching may delay the update of version.txt by up to 6 hours.