🐛 Wrong arch in the name of the img

[mauromorales]

The tag of the img in a repository is correct, e.g.: tumbleweed-standard-arm64-rpi4-v2.4.2-k3sv1.28.2-k3s1-img

However, when extracted:

$ IMAGE=quay.io/kairos/opensuse:tumbleweed-standard-arm64-rpi4-v2.4.2-k3sv1.28.2-k3s1-img
$ docker run -ti --rm -v $PWD/build:/build quay.io/luet/base util unpack "$IMAGE" /build
 INFO   Downloading quay.io/kairos/opensuse:tumbleweed-standard-arm64-rpi4-v2.4.2-k3sv1.28.2-k3s1-img to /build
 INFO   Pulled: sha256:419bf5032f4b7555678fe7aed89b90363c2516f19546f994b4b7e65f0297ad35 quay.io/kairos/opensuse:tumbleweed-standard-arm64-rpi4-v2.4.2-k3sv1.28.2-k3s1-img
 INFO   Size: 2.03GiB

The resulting file, contains the wrong arch in the name:

$ ls build/*img.xz
build/kairos-opensuse-tumbleweed-standard-amd64-rpi4-v2.4.2-k3sv1.28.2+k3s1.img.xz

[mauromorales]

The issue seems to come from

https://github.com/kairos-io/kairos/blob/0f9499de70e24bf6cb69b6fa253daf59070e1083/Earthfile#L810C2-L810C2

Because it will assume the TARGETARCH of whichever HOST platform it is running, since it is not forced on the caller

kairos/Earthfile

Line 99 in 0f9499d

BUILD +arm-image

However, forcing it makes the process, really slow, so maybe we need to introduce an in between step