GH Actions: set error reporting to -1
GH Actions: set error reporting to -1

The default setting for `error_reporting` used by the SetupPHP action is `error_reporting=E_ALL & ~E_DEPRECATED & ~E_STRICT` and `display_errors` is set to `Off`.

For the purposes of CI, I'd recommend running with `-1` and `display_errors=On` to ensure **all** PHP notices are shown.

Without this setting PHP 8.1 deprecation notices are not shown.

antecedent/patchwork