scripts: add docker context to buildx command

[gmtstephane]

This PR Closes #6223

Description of the change:
Fix make docker-buildx command by adding the temporary Dockerfile.cross context location

Motivation for the change:

Make docker-buildx works again

[everettraven]

@gmtstephane Thanks for this contribution!

One thing I noticed is that you are making changes to the operators we have scaffolded in our testdata directory. While this is an important step in the overall flow of resolving this issue, it unfortunately does not fix the root of the problem which is that this command is scaffolded in the Makefile by the go plugin which is maintained as part of the Kubebuilder project.

Taking a look at the Kubebuilder project, it seems this has already been fixed by kubernetes-sigs/kubebuilder#3046 and therefore we just need to update our Kubebuilder dependency in the go.mod file.

After the dependency is updated, running make generate should regenerate our testdata.

[gmtstephane]

@everettraven Thanks for the response.

I can confirm that updating kubebuilder fixed the problem for me
Maybe this fixed version should come as default in the go.mod ?

[everettraven]

Maybe this fixed version should come as default in the go.mod ?

@gmtstephane Yep, eventually we will update the dependencies that are built and shipped with the Operator SDK binary and this should be picked up. I think this should be sooner rather than later, but I am just returning from vacation and am not sure if it has already been discussed by other maintainers what the timeline for updating the version of our Kubebuilder dependency is.

[jmrodri]

@gmtstephane can you please sign your commits? It's failing the DCO check.

[everettraven]

@gmtstephane I am actually going to close this PR since the proper resolution of this issue is to update our Kubebuilder dependency version to one that contains this fix. Thanks for taking the time to make this contribution!