* each major role change can be recorded in upgrade_roles with a bump in iiab_revision to denote the addition
* test source for https://github.com/iiab/iiab-factory/pull/134
* keep iiab_revision with role name
* gitea
* introduce $INSTALLED_RELEASE $INSTALLED_REVISION into ansible
* set informational 'do_facts'
* 7.1.5-premap tag as starting point for iiab_revision 0
* no notes at all - use underscore for role name to match what is in iiab_state.yml
* use installed_revision trigger do_upgrade
do_reinstall will denote a major upgrade path in the future