FR for CI: add .deb package

[GitMensch]

@lefessan, this may be one of your issues ;-)

We do run with Ubuntu, so it seems reasonable to use it after generating the binaries to create a .deb package from this, using the PACKAGE_VERSION as upstream-verion and the revision number as debian-version.

Ideally we can pull the official deb sources from https://sources.debian.org/src/gnucobol/5/, do an adjustment for the version and possibly more as needed, then just run dpkg-deb.

as reference: Debian Maintenance Guide

Note: there are also other CI related issues open, at least #103 (sounds easy) and #50 (not sure where we stand there).