* Added test-ffi target, use it in CI
* Added clang-format config, fixed RETURN_STRING API mismatch
* Skip installing php and packages on the PHP docker images
* Removed al2 job that was never going to work, and compiler tests
* Fixed basic test for extension loading
* Cleaned up lib structure, fixed tests
* use test-ci target to conditionally test in GitHub
* Use v0.8.1 of builder
