How to get git.gitTagToVersionNumber value?

[ghost]

Hi all

I am using https://github.com/sbt/sbt-git and https://sbt-native-packager.readthedocs.io/en/stable/index.html and would like to assign the value of git.gitTagToVersionNumber to my docker container.

I tried:

git.useGitDescribe := true

Docker / dockerAlias := DockerAlias(None, Some("zerocoder"), (packageName in Docker).value, git.gitTagToVersionNumber.value)  

it does not work, because the type of the last argument of DockerAlias does not match.

How to get the value git.gitTagToVersionNumber?

I also tried:

git.useGitDescribe := true

git.formattedShaVersion := git.gitTagToVersionNumber.value("tag")
Docker / dockerAlias := DockerAlias(None, Some("zerocoder"), (packageName in Docker).value, git.gitDescribedVersion.value) 

But it does not supply the desired value. I would like to tag my docker container for example with:

v0.2.0-2-g8d5cd83

Thanks