Debian releases with a predictable version

Hi folks,

Whenever I upgrade versions of the Buildkite agent on Ubuntu, I find myself spinning up a VM to attempt to change the version, watch it fail, and then manually log in to find the full version of the Debian package with an `apt list buildkite-agent`.

For example, the last number is always incrementing and inconsistent, possibly a build number?

```
root@default-ubuntu-1804:~# apt list buildkite-agent -a
Listing... Done
buildkite-agent/unknown 3.26.0-3674 amd64
buildkite-agent/unknown 3.25.0-3651 amd64
buildkite-agent/unknown 3.24.0-3587 amd64
buildkite-agent/unknown 3.23.1-3540 amd64
buildkite-agent/unknown 3.23.0-3534 amd64
buildkite-agent/unknown 3.22.1-3416 amd64
buildkite-agent/unknown 3.22.0-3403 amd64
buildkite-agent/unknown 3.21.1-3397 amd64
buildkite-agent/unknown 3.21.0-3391 amd64
...
```

Is it possible to make this something consistent like `3.26.0-1`?