Remove GOARCH in ray-operator/Dockfile to support multi-arch images

[ideal]

E.g. with docker buildx build --platform linux/amd64,linux/arm64/v8

Why are these changes needed?

To support different architectures with multi-arch docker images with docker buildx, we should remove GOARCH=amd64 in Dockerfile.

Related issue number

None.

Checks

• I've made sure the tests are passing.
• Testing Strategy
  • Unit tests
  • Manual tests
  • This PR is not tested :(

[kevin85421]

I am not familiar with buildx, and I haven't been able to find any documentation on removing GOARCH in ray-operator/Dockerfile to support multi-architecture images. Could you please share some relevant resources?

This PR is not that risky as my first thought. We use GitHub Actions to build images, and all GitHub-hosted runners are x86_64, so it is not that risky to remove the GOARCH option.

[ideal]

Hi, @kevin85421

Basically, with docker buildx, we can build single image which contains variants for different architectures. When running container with that image, Docker can automatically selects the image that matches the user's OS and architecture.

Some resources:

https://docs.docker.com/build/building/multi-platform/

https://www.docker.com/blog/multi-arch-build-and-images-the-simple-way/

[kevin85421]

I need to clone your fork and test this PR on my own. Can you provide more details about how you manually test this PR and what's your environments?

[ideal]

@kevin85421 Could you please check this again?