keep also condainer-env in squashfs.

Hi Klaus,

whereas the base environment is created in the squashfs, the condainer environment is still created in the standard conda-envs folder (which is, e.g., /u/sebak/conda-envs). This is due to the --name parameter to $conda-exe env create. Is this the intended behavior? In particular when the python version requirement is different from the python version of the miniconda installer, this will still install a full python stack in the file system. Here are some changes such that also the condainer env goes into the squashfs. Still a little clumsy but I could polish in case this is desired? Otherwise please feel free to just close!

Cheers, Sebastian