apptainer: fix AppArmor incompatibility with Ubuntu 24.04

Fix issue 2319

Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>

examples/apptainer.yaml

@@ -30,6 +30,9 @@ provision:
     #!/bin/bash
     set -eux -o pipefail
     command -v apptainer >/dev/null 2>&1 && exit 0
+    # Workaround for https://github.com/apptainer/apptainer/issues/2027
+    echo "kernel.apparmor_restrict_unprivileged_userns = 0" >/etc/sysctl.d/99-userns.conf
+    sysctl --system
     # add the "Official PPA for Apptainer"
     add-apt-repository -y ppa:apptainer/ppa
     apt-get update