Merge branch 'feat/ci_update_to_use_squashfs' into 'main'

.gitlab-ci.yml

ci/apptainer_by_hand.sh

ci/fuse-overlayfs.sh

ci/install_compilers.sh

ci/prepare_squashfs.sh

ci/setup_spack.sh

ci/squashfuse_ll.sh

ci/stack_env.sh

ci/update_squashfs.sh

stacks/pinot-noir-gcc/modules_kuma_l40s.yaml

stacks/pinot-noir-gcc/modules_kuma_l40s.yaml

stacks/pinot-noir/modules_kuma_l40s.yaml

stacks/pinot-noir/modules_kuma_l40s.yaml