ci: retry on image pull error
ci: retry on image pull error

Try to avoid the following:

```
error pulling image configuration: received unexpected HTTP status: 500 Internal Server Error
```

Signed-off-by: Sébastien Han <62d754cc350e84d3b1c32ae79f976f5348e74a40@redhat.com>

rook/rook,rook/rook,rook/rook,rook/rook,rook/rook