host official deb and rpm repos on downloads.dlang.org

[singingbush]

There's already deb & rpm packages on downloads.dlang.org so it 
shouldn't be a huge leap to have 'official' (as in, hosted on 
dlang.org) repos for Ubuntu / Fedora users. Is there any appetite 
for doing this? I know I'd much prefer to get dmd/dub updated 
whenever I update my machine rather than having to do things like 
this:

```
sudo rpm --upgrade http://downloads.dlang.org/releases/$(date 
+'%Y')/dmd-2.097.1-0.fedora.x86_64.rpm
```

Also, there's letsencrypt ssl certs on both dlang.org and 
forum.dlang.org, why not also get https setup for 
downloads.dlang.org?