I modified the Docker local example to build images on the host instead of pulling from a registry. With this, it's very quick to iterate on new images and roll out updates. I'd probably still recommend using a registry and ci/cd for serious use cases 😉
https://gist.github.com/bpmct/badcccb259129870f4ad6a65b33f4565
(change
armv7
in main.tf to your architecture. I was testing on a Raspberry Pi)