gpg keys of older/newer fedora versions

[Zbigniew Jędrzejewski-Szmek]

[In light of https://bugzilla.redhat.com/show_bug.cgi?id=1241383]

'dnf install --installroot=... --releasever=XX dnf' can be used to bootstrap
a Fedora chroot. The only snag is that --nogpg is often recommended, because
fedora-repos only provides the GPG keys for the current and next release.

It would be convenient (and safe!) to provide keys for past and future releases,
so such bootstrapping can be done without either importing the keys manually
and/or using --nogpg.

I thought I'd ask here first: is there a strong reason *not* to include those keys?

Zbyszek