Error saving index-cache.yaml with Microsoft Azure as storage backend

```
Helm Chart: chartmuseum/chartmuseum@3.10.2
Docker image: ghcr.io/helm/chartmuseum:v0.16.1

---

STORAGE: microsoft
DISABLE_STATEFILES: false
```

We have a workflow using [changesets](https://github.com/changesets/changesets) where we occasionally release a bunch of our applications at once. Through a series of GitHub Actions each application gets built, packaged & uploaded to ChartMuseum, which uploads the Charts to an Azure Storage Account (blob).

We noticed a bunch of these GitHub Actions fail with the following error:
```
Error saving index-cache.yaml

storage: service returned error: StatusCode=409, ErrorCode=InvalidBlobType, ErrorMessage=The blob type is invalid for this operation.\nRequestId:...\nTime:..., RequestInitiated=..., RequestId=..., API Version=2018-03-28, QueryParameterName=, QueryParameterValue=
```

---

I assume the issue might be caused by the fact that ChartMuseum is trying to update `index-cache.yaml` multiple times at the same time, causing Azure to throw a 409 error.

What do you suggest we do to resolve this?
Should we just disable the `index-cache.yaml` statefile or is there an alternative solution? What is the exact effect if we do this?