logilab-devtools #71412 handling signing for automatic builds [resolved]

lgp build can pgp-sign the packages it builds, but if it's run by narval then signing needs to be disabled or set up to use a passphrase-less signing key.
Or possibly the former for automatic nightly builds, and the latter for manual release builds?

done in0.19.0
load left0.000
closed by#b4f173aa934a narval plugin: add an option to choose whether packages should be signed (closes #71412)