Document Arm Containers

[fkorotkov]

TLDR now you can use arm_container instead of container to run arm64 containers.

task:
  arm_container:
    image: ubuntu:latest
  script: uname -a

Fixes #218

[maflcko]

Is there an issue where arm doesn't upload the logs? See for example: https://cirrus-ci.com/task/4712248254922752?logs=clone#L1

[fkorotkov]

@MarcoFalke sorry for the inconvenience. We were testing and changing some last things. Now everything should work as expected

[real-or-random]

There seem to be some more issues: https://cirrus-ci.com/task/5504774142427136 (Or is this a bug in our config?)

[maflcko]

Maybe an intermittent issue? In our repo it still works fine.

Edit: Or maybe it can't run from a Dockerfile?

[fkorotkov]

@MarcoFalke, yeah, dockerfile for arm_containers is not yet supported. It's related to #900

[real-or-random]

Oh okay, I see, thank for letting us know!

[real-or-random]

dockerfile for arm_containers is not yet supported. It's related to #900

Are there plans to support this now that #900 has been done?

Basically all of our current Linux builds use a Docker image. If we could port that easily to ARM, I think this would help us a lot.

[fkorotkov]

@real-or-random actually now it's much simpler since GCP has Arm instances added #1027. Adding some parser improvements in cirruslabs/cirrus-cli#586 and shortly after we should be able to add dockerfile support. Note that instead of a single multi-arch container we'll build two separate images for each architecture.

[real-or-random]

Sounds great!

Note that instead of a single multi-arch container we'll build two separate images for each architecture.

Yep, and I also believe that's in general the better of the two alternatives.