Unconfined delegates access to open file descriptors. Therefore when
running a confined binary from unconfined, it will work even when the
attachment path is not read-allowed.
However, as soon as these confined binaries are run from another
confined process, this delegation is not permitted anymore and the
program breaks.
This has been the cause of several bugs such as
https://bugs.launchpad.net/ubuntu/+source/apparmor/+bug/2107455 or
https://github.com/canonical/snapd/pull/15181 .
Introduce `test_profile.sh`, a helper script that ensures confining
AppArmor profiles explicitly allow (at least) read access to their
attachment path.
Signed-off-by: Maxime Bélair <maxime.belair@canonical.com>
