Cache PHP post-install

Cache same PHP packages for all versions

Refactor workflow

Remove bintray and use cloudsmith for build mirror

Use latest zstd from homebrew

Add mysql to all PHP versions

Fix patch in php.sh

Fix patch in php.sh

Fix patch in php.sh

Add workflow_dispatch event in build.yaml

Install zstd using brew

Add PHP 8.0

Add PECL by default on all versions

Cleanup and replace hub with gh

Fix script link --skip-build

Push builds to GitHub releases