[SOLVED] How do I set the build output platform x86

How do I set the build output platform x86_64 in a Skaffold configuration?

Since I'm developing on an M1 mac, my Docker builds will build ARM. I want to build x86_64 images which I know I can build with the --platform flag but I want to do that with my Skaffold configuration.

Solution

Thanks to @p10l putting me on the right track, I was able to figure it out. Skaffold can't set the platform using the Docker Engine API, so we need to pass --platform=linux/x86_64 to the command line by setting useDockerCLI to true and adding cliFlags to our Docker configuration.

apiVersion: skaffold/v2beta26
kind: Config
build:
  # ... other unrelated config ...
  artifacts:
    - image: my-image
      context: ./
      docker:
        cliFlags:
          - --platform=linux/x86_64 
  local:
    useDockerCLI: true # the only way to set platform is with cliFlags so we need to enable the Docker CLI