Fix release script
Fix release script

Specify an "id" for each build, as this was otherwise inferred
and duplicate for our two builds.

Also remove the use of the deprecated "archive" instruction
in favour of "archives".

Fixes #981

improbable-io/grpc-gateway,gengo/grpc-gateway,improbable-io/grpc-gateway,grpc-ecosystem/grpc-gateway,gengo/grpc-gateway