Fix#136 (stop pulling the files from @griff's poor server), also add a script
to update the files.
The fun thing about this is that due to sourcing the files from
`https://gitlab.com/simple-nixos-mailserver/nixos-mailserver/raw/master/tests/clamav`
during the tests, updates to the `hashes.json` and `*.cvd` files will always
fail CI. I guess this is a reasonable tradeoff as long as people are aware of
it.
When a mailbox is created by sieve or is delivered to directly by IMAP commands,
created IMAP folders are not subscribed to by dovecot. These configuration
options change that.
Acked-by: Ruben Maher <ruben@maher.fyi>
Ruben MaherandRobin Raymond