Provide universal Linux binaries

[bubelov]

Currently, Core Lightning only provides Ubuntu and Fedora binaries, which is a bit odd since it's unlikely that it has any hard deps on those distros. I tried running Ubuntu 22.04 binaries on Arch and everything worked fine, except for some PostgreSQL dep which wasn't statically linked, apparently, so I had to install it via a package manager.

Bitcoin Core always provides universal Linux binaries, it would be nice if Core Lightning can follow the same pattern. Are there any technical reasons CL binaries aren't universal?

[whitslack]

What's a "universal Linux binary"? Different distributions ship with different versions of the C library (sometimes not even Glibc!) and sometimes make up their own sonames for shared libraries. Short of shipping an entirely self-contained package having only the Linux kernel as an external runtime dependency, I am not sure there can really be such thing as a "universal Linux binary."

[wtogami]

He's asking for something like how Bitcoin Core builds deterministic mostly-static binaries with minimal dependencies targeted to some old version of glibc that is a least common denominator to multiple old LTS Linux distros.

https://github.com/bitcoin/bitcoin/tree/master/contrib/guix
Bitcoin Core uses guix as a base to have a known clean bootstrap of a reproducible build environment to make reproducible binaries where anyone else can confirm that it is in fact bit-for-bit identical. That's superior to the current builds distributed by projects like CLN where can't say for 100% certain that the toolchain in that buildroot is clean.