`mix phx.gen.release --docker` can fail because hexpm/bob skips images

[aymanosman]

hexpm/bob can sometimes skip building images in a way that results in only one architecture being available, so an image might build fine on my laptop and fail to build on my infrastructure. See this.

I see you can explicitly pass the OTP and Elixir version you want after this, so maybe that is the way to go.

Although it is easy to workaround this, maybe worth thinking about a fix for a smoother experience for beginners.

[nathanKramer]

I'm a bit confused on what I'm supposed to do in this situation. I assume this error is due to the cause you described:

17:25:56.449 [debug] Fetching latest image information from https://hub.docker.com/v2/namespaces/hexpm/repositories/elixir/tags?name=1.19.5-erlang-28.3.1-debian-trixie-
** (RuntimeError) couldn't fetch https://hub.docker.com/v2/namespaces/hexpm/repositories/elixir/tags?name=1.19.5-erlang-28.3.1-debian-trixie-

Do I need to manually create the Dockerfile?

[nathanKramer]

Here's what I did to get it working, if it helps others:

brew uninstall elixir # I originally installed with brew

# Install with asdf, these versions have an image in dockerhub.
asdf install erlang 27.3.4.3
asdf install elixir 1.18.4-otp-27
asdf set --home erlang 27.3.4.3
asdf set --home elixir 1.18.4-otp-27

[SteffenDE]

@nathanKramer in that case, the issue is probably that docker hub frequently times out when we try to look for the correct image. I'm trying to see if we can get a more reliably source for the available image tags.