[Issue 24392] Installer not working: Can't check signature: No public key

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=24392

--- Comment #3 from Martin Nowak <code at dawg.eu> ---
More specifically, the keyring was updated by now, but it wasn't signed with
any of the existing keys, hence `install.sh update` might fail verifying the
new d-keyring. Maybe we should skip that verification step to not complicate
bootstrapping that much.

> A workaround is to import the updated key manually for now.
> `gpg --recv-keys E22EC04C82780970381402F4A7D4D42F8EC6A355`

Actually that should update the dlang keyring, not the default one.

`gpg --keyring ~/dlang/d-keyring.gpg --no-default-keyring --recv-keys
E22EC04C82780970381402F4A7D4D42F8EC6A355`

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