Pipeline builds are failing because of a 500 error coming from requests sent to quay.io

### Conda-forge documentation

- [X] I could not solve my problem using the conda-forge documentation.

### Installed packages

```shell
This is a build issue
https://dev.azure.com/conda-forge/feedstock-builds/_build/results?buildId=803562&view=logs&j=656edd35-690f-5c53-9ba3-09c10d0bea97&t=986b1512-c876-5f92-0d81-ba851554a0a3
```

### Environment info

```shell
This is a build issue
https://dev.azure.com/conda-forge/feedstock-builds/_build/results?buildId=803562&view=logs&j=656edd35-690f-5c53-9ba3-09c10d0bea97&t=986b1512-c876-5f92-0d81-ba851554a0a3
```

### Issue

See the following build error that is outside of our ability to fix.

https://dev.azure.com/conda-forge/feedstock-builds/_build/results?buildId=803562&view=logs&j=656edd35-690f-5c53-9ba3-09c10d0bea97&t=986b1512-c876-5f92-0d81-ba851554a0a3

```
Error response from daemon: Head "[https://quay.io/v2/condaforge/linux-anvil-cos7-x86_64/manifests/latest"](https://quay.io/v2/condaforge/linux-anvil-cos7-x86_64/manifests/latest%22): received unexpected HTTP status: 500 Internal Server Error
##[error]Bash exited with code '1'.
Finishing: Run docker build
```