Improved multi-arch support

[matejvasek]

This is needed for better experience on various platforms.

Issues:

• On Apple silicon builds takes much more time because of overhead incurred by emulation of amd64 on aarch64.
• Deployment to clusters with architecture not matching the architecture of developers machine:
  the image build on developer machine might not run in the cluster or it can run but with high performance penalty.

First step is to offer multi-arch builder images, this should ensure good build times on various developer machines.

• For s2i there is noting to do, images are already supporting amd64, aarch64, ppc64le and s390x.
• For buildpacks we depend on pakteo-buildpacks project to provide multi-arch images.

Second step is to allow user to choose architecture(s) of the image produced by func build, this ensues that images produced on developer machine would run in the cluster. This could be done by some flag or config value in func.yaml or some global config.

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[zroubalik]

/remove-lifecycle stale

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/lifecycle stale

[github-actions]

This issue is stale because it has been open for 90 days with no
activity. It will automatically close after 30 more days of
inactivity. Reopen the issue with /reopen. Mark the issue as
fresh by adding the comment /remove-lifecycle stale.