This will allow contributors to test changes in their own fork when
pushing without needing to make a pull request. This can be useful when
wanting to test out an idea before initiating a review process.
Make the following assumptions when defining concurrency:
- Pull request will work the same.
- Pushes to the neovim repo will work the same: each unique commit will
trigger a test run that won't cancel each other.
- Pushes to forks will cancel older CI runs on the same branch, similar
to how pull requests work.
This will create duplicate CI runs when doing a pull request, one in the
neovim repo for the pull request event and one in the fork for the push
event. This is an acceptable trade as the runs in the fork doesn't count
towards the CI limit of neovim. Contributors are also free to disable
these actions in their own fork if they wish.
Having to specify CI_BUILD for every CI job requires boilerplate. More
importantly, it's easy to forget to enable CI_BUILD, as seen by
8a20f9f98a. It's simpler to remember to
turn CI_BUILD off when a job errors instead of remembering that every
new job should have CI_BUILD on.
Multi-config generators can be tricky so testing them would be good.
Also test GCC release and MinSizeRel build types as they're prone to
unusual warnings. Remove release testing from test.yml as this is a
sufficient replacement.
Having a workflow that only builds neovim without running all of the
tests is a cheap way to test the build still works without burning too
much CI time.
