S7IPA-169 Add docker-based ubuntu packaging for libpostal

[rcmorano]

I couldn't make it DRYer for the gh-actions part, tried matrix and some other approach, but time is running so I left it with doubled steps for the release artifacts attachment. Also I'm not sure we really need different data for the two distributions, but just in case and for convenience, it's also doubled (and free :P).

Here is a PoC of an installation:

root@c7655eebfcb0:/src# curl https://github.com/StuartApp/libpostal/releases/download/1.0.0-2f7b5a7/ubuntu-18.04-libpostal_1.0.0+git2f7b5a7_amd64.deb -sLo pkg.deb
root@c7655eebfcb0:/src# dpkg -i pkg.deb
Selecting previously unselected package libpostal.
(Reading database ... 15219 files and directories currently installed.)
Preparing to unpack pkg.deb ...
Unpacking libpostal (1.0.0+git2f7b5a7) ...
Setting up libpostal (1.0.0+git2f7b5a7) ...
Installing data package '1.0.0-2f7b5a7' from GH releases...
root@c7655eebfcb0:/src# du -chsx /usr/share/libpostal/*
8.4M	/usr/share/libpostal/address_expansions
1.8G	/usr/share/libpostal/address_parser
4.0K	/usr/share/libpostal/base_data_file_version
4.0K	/usr/share/libpostal/data_version
75M	/usr/share/libpostal/language_classifier
4.0K	/usr/share/libpostal/language_classifier_model_file_version
392K	/usr/share/libpostal/numex
4.0K	/usr/share/libpostal/parser_model_file_version
19M	/usr/share/libpostal/transliteration
1.9G	total
root@c7655eebfcb0:/src#

[tutte]

Great job! 👨‍🍳