It would be nice to have tags (weeklies, v15, etc.) in `ci_hsc`, as that would make it easier to pick the consistent version to use with the stack.
For example, `ci_hsc` is ahead of v15.0 by one ticket (validating whether TransmissionCurves are attached to coadds,
DM-14008). So, scons-ing master ci_hsc with v15.0 fails today. Of course, one can pick the consistent ci_hsc version himself/herself. Having tags make that easier.