Add binary sums in releases

[davlgd]

trafficstars

Describe you feature request

Is your feature request related to a problem? Please describe. If I download a release from GitHub I can't check sum

Describe the solution you'd like Have .sha256 or .sha512 for each file to check downloaded files

Describe alternatives you've considered I manually calculate sums after a first download and use them in my packages using binaries

[dunglas]

Maybe could you use the SLSA attestations we generate? https://github.com/dunglas/frankenphp/attestations