Updating a deployment on fly.io

I’ve had my external UptimeKuma chugging away on fly.io , for free, for months now, and the container image it was based on was a bit out of date, so I wanted to update it. I hadn’t looked at fly.io for months, and couldn’t really recall what I’d done to create it.
The way this works is that that you create a fly.toml file that sets out the details of your app. From memory I think I used the one from the docs and gave it a unique name, the name of the Docker image, the port, the datacentre location, and the directory for the persisted data. The you run fly deploy from the directory with the toml file (having already installed the CLI tool and logged in) and you’re in business.
