Update main.yml

ci: run tests on php 8.3

ci: disable on cron schedule

ci: run tests on php 8.2

Improve CI triggers

- do not run on push expect when branch is master to prevent double runs in PRs
- run CI automatically daily

Raise min PHP version to 7.3

Test on PHP8.1

Update main.yml

opcache config might get wrapped up in the cache

Nix debug

Update main.yml

opcache build matrix

first shot enabling github actions