Improve Multi platform build process with docker buildx

[sebglon]

Is your feature request related to a problem?
I need to build from my Macos both image for ARM64 and AMD64.

Today, the docker build not follor the GOARCH selected. if we need to build a AMD64 on a macos, the docker image is flagged as ARM64.

Describe the solution you'd like
Use docker buildx and the platform generate a compatible container image for arm and amd.

Describe alternatives you've considered
Use another builder like buildah

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[knottnt]

@sebglon Just to confirm, you're referring to this call to docker build?

[knottnt]

@sebglon Okay, I see that we are incorrectly using a non-existent go_arch build arg here where we should be using target_arch to match the build arg in the Dockerfile. I've created a PR to fix the incorrect usage of GOARCH and add a --platform flag based on GOARCH's value.

[knottnt]

@sebglon The fix to properly use the target_arch build arg and base the --platform docker build flag on its value has been merged. If this fix doesn't fully resolve your issue please feel free to re-open.

/close

[ack-prow]

@knottnt: Closing this issue.

In response to this:

@sebglon The fix to properly use the target_arch build arg and base the --platform docker build flag on its value has been merged. If this fix doesn't fully resolve your issue please feel free to re-open.

/close

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