ci: skip host OpenAPI generation for arm64

ci/release-linux.sh

@@ -44,10 +44,18 @@ mkdir -p "$output" "$build_root" "$stage_root"
 
 publish_aot() {
   local name="$1" project="$2" destination="$3"
+  local openapi_args=()
+  # The API document is generated from the host executable. During an x64 to
+  # arm64 cross-publish, that build-time tool cannot run the target binary;
+  # the checked-in OpenAPI document is already available for this release.
+  if [[ "$rid" == linux-arm64 && "$name" == backend ]]; then
+    openapi_args=(-p:OpenApiGenerateDocuments=false)
+  fi
   (cd "$root/backend" && dotnet publish "$project" \
     -c Release -r "$rid" --self-contained true \
     -p:PublishAot=true -p:StripSymbols=true -p:DebugType=none \
     -p:ObjCopyName="$objcopy" \
+    "${openapi_args[@]}" \
     --artifacts-path "$build_root/$name" \
     -o "$destination")
 }