When using podman on Fedora 34 (at least), the registry from which to fetch the image is asked. Let's allow a less interactive experience by being able to specify it.
The registry is only used when fetching remotely and not when building locally (passing buildlocal="1" to pyrex.ini).
When using a locally built image, the registry just needs to be unset.
Right now the registry is docker.io as the images are hosted on hub.docker.com.
When using podman on Fedora 34 (at least), the registry from which to fetch the image is asked. Let's allow a less interactive experience by being able to specify it.
The registry is only used when fetching remotely and not when building locally (passing buildlocal="1" to pyrex.ini).
When using a locally built image, the registry just needs to be unset.
Right now the registry is docker.io as the images are hosted on hub.docker.com.