With both dataservice and fake-gcs-server running in docker, store.PutFS() on the index fails.

[wintermute-cell]

I don't know what's happening here, any suggestions or contributions welcome!

Description

When running both the dataservice and the fake-gcs-server as docker containers, in a shared network, the dataservice's fetchAndStoreAssets() errors in the storage.PutFS(storage.IndexDirName, storage.IndexArchiveName) call, when that function reaches this line:

obj := bkt.Object(nameInStorage)
w := obj.NewWriter(ctx)
if _, err := w.Write(archiveBytes); err != nil {
    return fmt.Errorf("Writer.Write: %v", err)    // <- error happens here
}

This is the error that is returned:

Post "http://0.0.0.0:4443/upload/storage/v1/b/itchgrep-data/o?uploadType=resumable&name=index.bleve.gz.tar&upload_id=3ea72214406f9c4c91a02539b9a0fe8b": dial tcp 0.0.0.0:4443: connect: connection refused

This behaviour can be observed when locally running the setup with task local-dataservice.

Findings so far

It seems like this issue is somehow caused by the interaction with Docker.
When the dataservice is not running in a docker container, the problem does not occur, and the index is stored on the fake-gcs-server just fine.

As a temporary solution, the dataservice can be run this way using task local-dataservice-temp-fix.