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I verified that this PR results in a successful apptainer installation.

However, I ran into the following error when attempting to use apptainer in a codespace (using the "codespaces-dev" dev container, i.e. .devcontainer/codespaces-dev/devcontainer.json) :

/tmp -> apptainer pull docker://docker.io/library/ubuntu:24.04
...
/tmp -> apptainer exec ubuntu_24.04.sif cat /etc/os-release
INFO   : A system administrator may need to enable user namespaces, install
INFO   :   apptainer-suid, or compile with ./mconfig --with-suid
ERROR  : Failed to create user namespace: user namespace requires to set /proc/sys/kernel/unprivileged_userns_clone to 1
/tmp -> cat /proc/sys/kernel/unprivileged_userns_clone
1       

Ultimately the following dev container runArgs were required to resolve all errors with the above apptainer exec command:

    "runArgs": [
        "--device=/dev/fuse",
        "--security-opt=seccomp=unconfined",
        "--security-opt=apparmor=unconfined"
    ],

For the "local-dev" dev container (.devcontainer/local-dev/devcontainer.json), the following sufficed in my environment---RockyLinux 8.10 with rootless Podman:

    "runArgs": [
        "--device=/dev/fuse"
    ],

though the other two --security-opt... options did no harm. (Note the "docker-outside-of-docker" feature does not appear to be immediately compatible with rootless podman, and was commented out).

What's the status of this? Is it still needed, and if so what do we need to get it done?

@mribeirodantas Is this good to go?

Actually, no. Singularity is not even being installed anymore :|. As the only training using singularity is the archived one, I think we can close this with wontfix.

Dropping this