Add changelog attribute to pkg_deb rule

[k0walik]

I noticed the pkg_deb rule does not provide changelog input attribute, while pkg_rpm does. Is it intended behavior? My use case assumes creating DEB and RPM packages, where the changelog is automatically generated and forwarded to package generation rules.

While looking at the rule implementation it seems to be trivial task.

[aiuto]

Not intended. It's just that no one ever bothered to add it.