Removes deprecation notices on actions builds. v5 updates the version of
node and `cache: false` disables the errors related to not finding a
go.sum

`setup-php` action was fixed to add embed SAPI for older versions of PHP

The info and above errors should be more than enough for debugging
failures in GitHuB Actions CI.

This commit adds GitHub Actions configuration, running tests on
pull-requests and master push changes.

This change is meant to be a first-pass at our evolving CI processes.

- Tests run in parallel per language for speed and isolation
- Test matrix is composed by a string list of languages and versions
- `setup-${language}` actions are preferred over base (and changing)
  versions from `ubuntu-latest` operating system

A few caveats with the current setup:

- Only tests on Ubuntu (no FreeBSD or Alpine)
- Unpriviledged tests only
- No core dumps available on failure