[$] Bootstrappable builds

The idea of ReproducibleBuilds-being able to recreate bit-for-bit identical binaries using thesame source code-has gained momentum over the last few years.Reproducible builds provide some safeguards against bad actorsin the software supply chain. But building software depends on the toolsused to construct the binary, including compilers and build-automation tools, many ofwhich depend on pre-existing binaries. Minimizing the reliance on opaquebinaries for building our software ecosystem is the goal of the Bootstrappable Builds project.