Provide Alpine images for ARM

[amyspark]

Hey,

I've just ran into a separate issue when trying to set up CI for my little project (rust-lang/cargo#7563).
I wanted to try other alternatives on my Raspberry Pi 4, but I noticed that Alpine-based images are provided only for x64.

Would it be possible to add ARM platforms to the list as well?

[sfackler]

We'd first need a rustup distribution for your target, and currently the only MUSL-based one is x86_64.

[tcurdt]

@sfackler Maybe I missing something but rustup target list | grep musl does list arm. What is missing? Or has this been fixed since? I was looking for the same images.

[sfackler]

That means that there is a Rust toolchain for ARM musl. There is not a rustup binary for ARM musl, though: https://rust-lang.github.io/rustup/installation/other.html

[tcurdt]

@sfackler Thanks for clarifying! Are you aware of an open issue for that in rustup land?

[sfackler]

Not off the top of my head. You could check their github.

[tcurdt]

This seems related rust-lang/rustup#2003

[tcurdt]

@sfackler I am a little unsure on the path forward. IIUC the only reason why there is no rustup binary for ARM (which is required for alpine arm images), is because there are not enough build minutes?

[sfackler]

I am not involved in rustup - you should ask them.

[tcurdt]

Alright, I asked on the rustup issue.