build + publish docker image

[ashleygwilliams]

e.g. https://github.com/libsql/sqld/blob/main/.github/workflows/publish.yml#L27

[Gankra]

Historical context: this was describing a feature that would build a docker image containing your binaries, such that someone could "run your app" by just fetching and running the docker image.

One of the annoyances we ran into is that docker really likes to make "build + publish" a single operation, whereas we would prefer to build the docker image in an earlier step in parallel with everything else, and then only publish it afterwards, on a potentially different machine.

While docker has some facilities for exporting/importing an image in a way that isn't Publishing It, it requires some special modes to be enabled that are incompatible with other useful features like multi-arch docker images. Docker is a frustrating mess.

At least one user has opted to do custom docker build + publish stuff in their build step as a result, which is understandable given the issues.