All singularity build templates will be built with identical names

[adswa]

The current naming scheme for built singularity images derives only from the cfgtype and the cfgarch, such that any Singularity-based environment will be called "singularity-.sif``. This name does not encode the identifier of the template, and thus it will be impossible to have builder datasets with several Singularity-based but different build enviroments next to eachother.
As discussed in the call, we can fix this with parametrizing cfgarch, cfgtype, and template, and creating the buildenvironment names from all of them