[atomic-wg] Issue #276: Set architecture label in the base container image

[Honza Horak]

hhorak reported a new issue against the project: `atomic-wg` that you are following:
``
I believe that setting the architecture label in every layered Dockerfile is not
necessary, it might be even problematic once we'll have containers on non-intel
platforms, because then we'd need to either maintain more copies of Dockerfiles with
different architecture labels or remove it later (when we'll have more layered
Dockerfiles to maintain at that point).

So, I'd like to propose to set the architecture label in the container base image, so
it is inherited in the layered images and we don't need to hard-code it there. Then,
setting architecture label should be made prohibited (or obsolete) in
https://fedoraproject.org/wiki/Container:Guidelines.
``

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https://pagure.io/atomic-wg/issue/276