Make it work without internet connection

[bast]

This might need few adaptations but we need to:

• demonstrate that it runs without network connection
• and then we can even prevent it from being able to access network

[bast]

Bootstrap: docker
From: ubuntu:24.04

%post
    apt-get update -y
    apt install -y curl

%runscript
    curl https://example.com > /dev/null 2>&1
    if [ $? -eq 0 ]; then
        echo "Internet connection is available from the container."
    else
        echo "No internet connection from the container."
    fi

%help
    Try with and without network:
    $ singularity run test.sif
    $ singularity run --net --network=none test.sif