build and push esgz image for all platforms

As the project's BuildKite infrastructure is expanding to test against
the ARM architecture, the image used for remote snapshotter testing will
need to be built for ARM. By pulling the image and optimizing with the
--all-platforms flag, we can provide ARM support.

Signed-off-by: Gavin Inglis <giinglis@amazon.com>

Author: ginglis13

Makefile

@@ -431,8 +431,8 @@ DEFAULT_BASE_IMAGE=public.ecr.aws/amazonlinux/amazonlinux:latest
 DEFAULT_ESGZ_IMAGE=ghcr.io/firecracker-microvm/firecracker-containerd/amazonlinux:latest-esgz
 .PHONY: esgz-test-image push-esgz-test-image
 esgz-test-image: stargz-snapshotter
-	$(CTR_REMOTE_BIN) image pull $(DEFAULT_BASE_IMAGE)
-	$(CTR_REMOTE_BIN) image optimize --oci $(DEFAULT_BASE_IMAGE) $(DEFAULT_ESGZ_IMAGE)
+	$(CTR_REMOTE_BIN) image pull --all-platforms $(DEFAULT_BASE_IMAGE)
+	$(CTR_REMOTE_BIN) image optimize --all-platforms --oci $(DEFAULT_BASE_IMAGE) $(DEFAULT_ESGZ_IMAGE)
 
 push-esgz-test-image:
-	$(CTR_REMOTE_BIN) image push -u $(GH_USER):$(GH_PERSONAL_ACCESS_TOKEN) $(DEFAULT_ESGZ_IMAGE) $(DEFAULT_ESGZ_IMAGE)
+	$(CTR_REMOTE_BIN) image push -u $(GH_USER):$(GH_PERSONAL_ACCESS_TOKEN) $(DEFAULT_ESGZ_IMAGE) $(DEFAULT_ESGZ_IMAGE)