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Build i386 image in GitHub workflow

I've been looking over this guide on how to choose the runner for a GitHub workflow (e.g., ubuntu-22.04).

Is there a way to specify the processor architecture of the runner? My GitHub workflow builds and pushes a Docker image to Docker Hub and I'd like to create both i386 and x86_64 images.

Solution

  • For building multi-arch docker images, you can follow Multi-platform image with GitHub Actions. It uses docker/build-push-action. You can use its platforms input parameter to specify different platforms and architectures.