Add example of multi-arch oci_tarball

examples/multi_arch_go/BUILD

@@ -0,0 +1,66 @@
+load("@aspect_bazel_lib//lib:transitions.bzl", "platform_transition_binary")
+load("@io_bazel_rules_go//go:def.bzl", "go_binary", "go_library")
+load("@rules_pkg//:pkg.bzl", "pkg_tar")
+load("@rules_oci//oci:defs.bzl", "oci_image", "oci_image_index", "oci_push", "oci_tarball")
+
+go_library(
+    name = "lib",
+    srcs = ["main.go"],
+    importpath = "main",
+)
+
+go_binary(
+    name = "bin-x86_64",
+    embed = [":lib"],
+    goos = "linux",
+    goarch = "amd64",
+)
+
+pkg_tar(
+    name = "bin-x86_64_tar",
+    srcs = [":bin-x86_64"],
+    package_dir = "usr/local/bin",
+)
+
+go_binary(
+    name = "bin-arm64",
+    embed = [":lib"],
+    goos = "linux",
+    goarch = "arm64",
+)
+
+pkg_tar(
+    name = "bin-arm64_tar",
+    srcs = [":bin-arm64"],
+    package_dir = "usr/local/bin",
+)
+
+oci_image(
+    name = "image-x86_64",
+    base = "@ubuntu_linux_amd64",
+    entrypoint = ["/usr/local/bin/bin-x86_64"],
+    tars = [":bin-x86_64_tar"],
+)
+
+oci_image(
+    name = "image-arm64",
+    base = "@ubuntu_linux_arm64_v8",
+    entrypoint = ["/usr/local/bin/bin-arm64"],
+    tars = [":bin-arm64_tar"],
+)
+
+oci_image_index(
+    name = "image-multiarch",
+    images = [
+        ":image-arm64",
+        ":image-x86_64",
+    ],
+)
+
+oci_tarball(
+    name = "image-multiarch-tar",
+    image = ":image-multiarch",
+    repo_tags = [
+        "docker.com/example:latest",
+    ],
+)

examples/multi_arch_go/main.go

@@ -0,0 +1,7 @@
+package main
+
+import "fmt"
+
+func main() {
+    fmt.Println("yo")
+}