spack.yaml: support packages with git branch names containing '/' to have a projection ?

[harshula]

Do we need build-ci to be able to support a spack.yaml with / in a package's git branch name? e.g.

    um7:
      require:
        - '@git.dev/access-esm1.6=access-esm1.6'

I don't think we can have a projection that has / in the module file name. e.g.

um7: '{name}/dev/access-esm1.6-{hash:7}'

Can we allow / to be replaced by - in the projection?

[harshula]

If build-cd allows a / to be replaced by a - in the projection. We have a workaround.