Allow multi-arch manifest-list from make container

[kaovilai]

by changing output type to image.

Then you can execute command like so to create a multi-arch image

BUILDX_PLATFORMS=linux/amd64,linux/arm64 make container

When output type is docker, only single arch is supported and following error is observed.

ERROR: docker exporter does not currently support exporting manifest lists

Signed-off-by: Tiger Kaovilai [email protected]

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[kaovilai]

/kind changelog-not-required

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.21%. Comparing base (aab2140) to head (3f4a1c2).
Report is 76 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8252   +/-   ##
=======================================
  Coverage   59.21%   59.21%           
=======================================
  Files         367      367           
  Lines       30841    30841           
=======================================
  Hits        18262    18262           
  Misses      11119    11119           
  Partials     1460     1460           

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