ci: Fix oras ArtifactHub config push (#5725)

Author: jonathan-innis

hack/release/common.sh

@@ -91,7 +91,14 @@ publishHelmChart() {
   yq e -i ".version = \"${version}\"" "charts/${helm_chart}/Chart.yaml"
 
   cd charts
-  [[ -s "${ah_config_file_name}" ]] && oras push "${oci_repo}/${helm_chart}:artifacthub.io" --config /dev/null:application/vnd.cncf.artifacthub.config.v1+yaml "${ah_config_file_name}:application/vnd.cncf.artifacthub.repository-metadata.layer.v1.yaml"
+  if [[ -s "${ah_config_file_name}" ]]; then
+    # ECR requires us to create an empty config file for an alternative
+    # media type artifact push rather than /dev/null
+    # https://github.com/aws/containers-roadmap/issues/1074
+    temp=$(mktemp)
+    echo {} > "${temp}"
+    oras push "${oci_repo}/${helm_chart}:artifacthub.io" --config "${temp}:application/vnd.cncf.artifacthub.config.v1+yaml" "${ah_config_file_name}:application/vnd.cncf.artifacthub.repository-metadata.layer.v1.yaml"
+  fi
   helm dependency update "${helm_chart}"
   helm lint "${helm_chart}"
   helm package "${helm_chart}" --version "${version}"