AzureFileShareService fails to upload a directory if path does not already exists on the shared storage

[motus]

e.g. the following directory upload fails:

{
    "from": "environments/apps/mysql/scripts/remote/common/",
    "to": "$experiment_id/$trial_id/scripts"
}

if path $experiment_id/$trial_id/ does not already exist on the file share.

Uploading a single file works, though - and I currently use it as a workaround, e.g.:

{
    // FIXME: A workaround for the bug in Azure FileShare Service.
    // Copy one known local file to trigger `mkdir -p` on the file share.
    "from": "environments/apps/mysql/scripts/remote/common/common.sh",
    "to": "$experiment_id/$trial_id/scripts/common.sh"
},
{
    "from": "environments/apps/mysql/scripts/remote/common/",
    "to": "$experiment_id/$trial_id/scripts"
}

@eujing want to look at it?