enable docker multi-platform build

[fuxingloh]

/kind feature
/area workflow

Add multi-platform build by fixing OOM issues due to buildx parallelization without resource oversight.

Currently disabled due to parallelization causing out-of-memory (exit code 137).

Originally posted by @fuxingloh in #163 (comment)

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[fuxingloh]

Ideally, we should separate them into different jobs using separate runners.

See docker/build-push-action#671