add real CI with full test run; support index-v2 on bullseye
requested to merge eighthave/ansible-role-install-fdroidserver-dependencies:ci-and-bullseye into master
This adds a complete test run on bullseye, including running the fdroidserver test suite. It adds some other checks too. There is no complete test run in stretch or buster since those aren't supported in production. There is a test run of the Ansible playbook on buster.
This also installs apksigner from backports on bullseye since index-v2 requires that version at a minimum.