Enable pre-packaged-binary download method

[yatsukhnenko]

See php/pie#436

[asgrim]

Note; there is little point in using pre-packaged-binary unless you also pre-package the binary and attach it to the releases.

It may help to use this:

A new GH Action uses: php/pie-ext-binary-builder@0.0.2 has been made: https://github.com/php/pie-ext-binary-builder - this will build the ext, name the zip files correctly, and attach them to the nominated release.

I recommend you read the docs! I've just updated them to hopefully make the feature clearer :) https://github.com/asgrim/pie/blob/55f9985c48eaa39d1cb3c5d25f1fc4159ed8ce9f/docs/extension-maintainers.md#download-url-method

[asgrim]

Oh - also note that pre-packaged-binary will not be available until 1.4.0 is released!