Added enroot support.

Lars Bilkerequested to merge
enroot into main

enroot is another fully unprivileged container runtime.

New options:

  • -E option for converting to enroot squashfs image
  • --enroot_file for specifying enroot filename

cc: @TobiasMeisel In this MR I also changed the ogs install location to /usr/local/ogs. Also the ogs binaries are now always in the PATH, no need to specify --app ogs on singularity exec-calls. I will updated the ogs docs accordingly.

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