images: Support building for specific target platform(s)
Add a variable BUILD_TARGET_PLATFORMS that allows users to specify one or
more target platforms, e.g. "linux/amd64", "linux/amd64,linux/arm64".
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Add a variable BUILD_TARGET_PLATFORMS that allows users to specify one or
more target platforms, e.g. "linux/amd64", "linux/amd64,linux/arm64".