Virtual-environments: "--platform" is only supported on a Docker daemon with experimental features enabled

[BrightRan]

Associated community ticket: https://github.community/t/enabling-docker-cli-experimental/126247

When setup a container job in the workflow, and use the '--platform' at the 'options' key,

jobs:
  job1:
    runs-on: ubuntu-latest
    container: 
      image: racket/racket-ci:latest
      options: --init --platform linux/amd64
    steps:
      . . .

The "Initialize containers" step always returns the error below:

"--platform" is only supported on a Docker daemon with experimental features enabled

[miketimofeev]

Hi @BrightRan @pmatos!
Take a look here, please. Looks like it's the similar issue
https://github.com/actions/virtual-environments/issues/368

[pmatos]

Thanks @BrightRan for creating the issue.

[pmatos]

@miketimofeev Thanks for the reference to #368 but unsure the solution helps.
The solution instructs you to restart the docker daemon with experimental features enabled, however, when you specify a container you don't have access to the system anymore since all the steps will be already ran inside the container.

Unless there's a way to only enter the container after a few steps, I am not sure how to do this.

[miketimofeev]

@pmatos got it, thanks. Yeah, it looks like we can't enable experimental features during containers job.
I'm afraid, we don't have a plan to pre-enable them on the image as well because of the possible negative impact.

[pmatos]

Could we optionally enable them, through a keyword to the container?

[miketimofeev]

@pmatos it's not possible at the moment and as I know we don't have a plan to implement this functionality.
@alepauly could you please confirm?

[alepauly]

@alepauly could you please confirm?

Correct. @pmatos, unfortunately it would require some changes to enable it before things boot up. We'll consider it but it's not something that can be done at this time. Thanks.

[pmatos]

Thank you for the feedback - disappointing though.