Repo name/path/tag generation fails validation for https-cloned repos

[serchaos]

Example output:

khornberger@localghost:~/dev/go/src/github.com/team $ git clone https://github.com/team/project.git
Cloning into 'project'...
remote: Counting objects: 3136, done.
remote: Compressing objects: 100% (2502/2502), done.
remote: Total 3136 (delta 405), reused 3103 (delta 394)
Receiving objects: 100% (3136/3136), 19.06 MiB | 3.17 MiB/s, done.
Resolving deltas: 100% (405/405), done.
Checking connectivity... done.
khornberger@localghost:~/dev/go/src/github.com/team $ cd project/
khornberger@localghost:~/dev/go/src/github.com/team/project $ stevedore-build -verbose
2016/02/08 12:11:48 > git config --get remote.origin.url
2016/02/08 12:11:48 > git rev-parse --show-toplevel
2016/02/08 12:11:48 > git rev-parse HEAD
2016/02/08 12:11:48 Building docker.io//--github.com-team-project:f8ds945
> docker build -t docker.io//--github.com-team-project:f8ds945 -f Dockerfile .
repository name component must match "[a-z0-9](?:-*[a-z0-9])*(?:[._][a-z0-9](?:-*[a-z0-9])*)*"
2016/02/08 12:11:48 error building docker.io//--github.com-team-project:f8ds945
2016/02/08 12:11:48 exit status 1