create multi arch image #14

Job	Run time
unit-test / build	30s
build-oci-image-jvm-aarch64 / build	2m 24s
build-oci-image-jvm-amd64 / build	1m 43s
save-image-jvm-amd64 / save	5s
push-multi-arch-image-jvm / build	6s
save-image-jvm-aarch64 / save	9s
	4m 57s

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