We add a new make goal called release-install that creates the same
reproducible binaries as the release script would create, but only for
the current OS/architecture. It then installs those binaries to the
system's GOBIN directory.
To allow easy verification of individual binaries (instead of just the
packag tarballs/zips), we also add the hashes of lnd and lncli binaries
to the manifest. We do the same in the docker build.
A number of tricks need to be applied to the tar and zip commands
respectively to make sure they always produce deterministic archives.
This includes setting the file timestamps to a fixed date and setting
specific ownership attributes (tar) or no attributes at all (zip).
Because this script is now run from the main Makefile, it is more
suitable to be located in the main scripts folder where the other
build related scripts reside.
