CI:
- Update Ubuntu to 20.04, the lowest available starting in April 2023 [1]
- Don't test 19.3, as it isn't available in Ubuntu 20.04
- Use OTP 25 for Shellcheck, Coveralls, ECIL page
- Use erlef instead of ErlGang, supports better old erlangs in new ubuntus
- Remove support for rebar2 testing, as that's done in Runtime
CI-19.3:
- Add a temporary workflow for testing ejabberd with OTP 19.3
Container and Runtime:
- Update Ubuntu to latest (22.04)
[1] https://github.com/actions/runner-images/issues/6002https://github.com/ErlGang/setup-erlanghttps://github.com/erlef/setup-beam