Make release helper script publish multi-arch images

We need to update the release helper script accordingly to publish
multi-arch images.

Signed-off-by: Hyounggyu Choi <[email protected]>

hack/release-helper.sh

@@ -81,21 +81,30 @@ function tag_and_push_packages() {
     for staged_pkg_name in ${!staged_to_release[@]}; do
         release_pkg_name=${staged_to_release[${staged_pkg_name}]}
 
-        # pull the staged package
-        docker pull ${ghcr_repo}/${staged_pkg_name}:${release_candidate_sha}
-
         # set tag prefix (if needed)
         release_tag_prefix=
         if [[ -v staged_to_release_tag_prefix[${staged_pkg_name}] ]]; then
             release_tag_prefix=${staged_to_release_tag_prefix[${staged_pkg_name}]}
         fi
         release_tag_full=${release_tag_prefix}${release_tag}
 
-        # tag it
-        docker tag ${ghcr_repo}/${staged_pkg_name}:${release_candidate_sha} ${ghcr_repo}/${release_pkg_name}:${release_tag_full}
+        for arch in x86_64 s390x; do
+            # pull the staged package
+            docker pull ${ghcr_repo}/${staged_pkg_name}:${release_candidate_sha}-${arch}
+
+            # tag it
+            docker tag ${ghcr_repo}/${staged_pkg_name}:${release_candidate_sha}-${arch} \
+                ${ghcr_repo}/${release_pkg_name}:${release_tag_full}-${arch}
+
+            # push it (i.e. release it)
+            docker push ${ghcr_repo}/${release_pkg_name}:${release_tag_full}-${arch}
+        done
 
-        # push it (i.e. release it)
-        docker push ${ghcr_repo}/${release_pkg_name}:${release_tag_full}
+        # Publish the multi-arch manifest
+        docker manifest create ${ghcr_repo}/${release_pkg_name}:${release_tag_full} \
+            --amend ${ghcr_repo}/${release_pkg_name}:${release_tag_full}-x86_64 \
+            --amend ${ghcr_repo}/${release_pkg_name}:${release_tag_full}-s390x
+        docker manifest push ${ghcr_repo}/${release_pkg_name}:${release_tag_full}
     done
 }