The commit author's email was the forge account's own address, read with
the site-admin token, which put an email the account may keep private
into the target repo's history. It is now the address Forgejo itself
uses for such an account's web commits, `<lowercased login>@<NO_REPLY_ADDRESS>`
(models/user/user.go GetPlaceholderEmail). NO_REPLY_ADDRESS defaults to
`noreply.<DOMAIN>` (modules/setting/service.go) and the forge module
leaves it unset, with DOMAIN set from services.hyperhive.swarm.forge.domain,
the same option SWARM_CONTROLLER_FORGE_URL is built from; so the domain is
that URL's host. The account is still read, to refuse a user with no
forge account, but its email no longer is.
Refs #5259
c90bd705a7