fix: failed build in ARM

[luislhl]

Motivation

We had problems building the cryptography package

See the error in https://github.com/HathorNetwork/tx-mining-service/runs/6905469491?check_suite_focus=true

Downgrading to alpine3.15 still errors out: https://github.com/HathorNetwork/tx-mining-service/runs/6907057307?check_suite_focus=true

Since the process apparently suffered a Kill -9, it's possible that it was using too much RAM during compilation and got OOM Killed.

Solution

See #84 (comment)

This is the working build after the fix: https://github.com/HathorNetwork/tx-mining-service/runs/6993659510?check_suite_focus=true

[jansegre]

I suggest switching the python base image from -alpine to -slim, which is Debian based. Mainly because it's easier and faster to just use the official wheels provided by cryptography, which use manylinux, which, if I'm not mistaken, works on Debian but not on Alpine.

I had a similar issue on hathor-core, however since we recently switched to a Debian base image it is now only affecting pypy+arm builds, because there aren't official wheels for those.

The other alternative I think would be to set-up our own runners, which we can make more beefy and also we can have arm runners that will run the arm tasks (although to make that work with the Docker build we'd have to make a few changes). But even just running our own runners seems like a big undertaking already.

[luislhl]

I suggest switching the python base image from -alpine to -slim, which is Debian based. Mainly because it's easier and faster to just use the official wheels provided by cryptography, which use manylinux, which, if I'm not mistaken, works on Debian but not on Alpine.

Yeah, it makes sense to try to use the official wheels. But while learning about this, I saw that apparently they provide wheels for musllinux as well, not only manylinux: https://cryptography.io/en/latest/installation/#static-wheels

musllinux wheels should support Alpine.

Apparently our build was not using them just because Poetry was not prepared yet to use musllinux wheels: python-poetry/poetry#5225

After upgrading to Poetry 1.2.0b2, the build was able to use the wheels as expected.

So I think this is enough to solve it. What do you think?