changed versioning logic through go generate & go embed

[fedeztk]

Now all version follow the git revision logic:

printf "r%s.%s" "$(git rev-list --count HEAD)" "$(git rev-parse --short HEAD)"

A gh action update a file (.version) with the content of the above printf. It is then embedded in the go binary.
This change aims to reach consistency and ease of use in got's versioning by unifying the standard way of git packaging version in arch linux together with go install, make, docker etc.