Due to a misunderstanding of how the gpg command line options work, we
didn't actually create detached signatures because the --clear-sign
flag would overwrite that. We update our verification script to now only
download the detached signatures and verify them against the main
manifest file.
We also update the signing instructions.
Instead of only allowing the installed versions of lnd and lncli to be
verified, we now also support specifying explicit paths to binaries that
we want to verify.
When verifying the release signatures, we don't want to fail if a
signer's signature is not available in the gpg key ring. Instead we just
don't want to count the signature for now and still succeed if there's
at least one other good sig with a known key.
The verification script makes sure the hashes of the binaries inside of
a docker image match those of an official release.
The script first downloads all signatures, validates them, then compares
the hashes of the installed binaries to those contained in the detached
signature files.
