Fix Makefile git tag

[rach-id]

Currently, when running make build, we have the following warning, even if the build has succeeded:

fatal: No tags can describe 'd51c111b00c5de8a3336ec37a5027634e2ef7719'.
Try --always, or create some tags.

which comes from this line:

orchestrator-relayer/Makefile

Line 3 in b21d278

VERSION := $(shell echo $(shell git describe --tags) | sed 's/^v//')

That needs to be fixed.