[feature] Support S3 virtual hosted style

[sanchesoon]

Feature Area

/area backend

What feature would you like to see?

To be able use Virtual Host Style S3 protocol we should provide configuration option. Because "by default, the S3 client will use virtual hosted bucket addressing when possible." According aws-sdk-go documentation.

What is the use case or pain point?

Ability to switch between Virtual Host and Path Style

Is there a workaround currently?

There is no work round for this. Because this is hardcoded https://github.com/kubeflow/pipelines/blob/master/backend/src/v2/objectstore/object_store.go#L260

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[HumairAK]

/assign @HumairAK

[thesuperzapper]

@sanchesoon what additional benefit would this give us?

I am pretty sure it would take a lot of work, which would be better spent on other problems which actually affect the user experience.

[sanchesoon]

@thesuperzapper It give us ability to use Virtual Host style. Not sure if here a lot work, should be just additional parameter to pass launcher (but I never did PR here)
BTW this was fixed in argo workflow https://github.com/argoproj/pkg/pull/368/files