I tried to build whisperfish with the SDKs Docker based build engine, but I ran into a problem that seems to be fixed in a newer version of cargo. Now, I would like to try a newer version of cargo and rust to build whisperfish, but I couldn’t find a way to get these into the docker build engine. I think the sfdk tools install-custom (forgive me if I mixed up the sub-command word order, but I am currently not on a system with sfdk, so I can't look it up) could be used to install custom build tools, but the documentation doesn’t really show how. Do I need RPMs to install the tools?
Ok, I found this https://github.com/sailfishos/rust, but I could not find out how to build it with a newer version of cargo and rust. Any help would be greatly appreciated.