docs(apparmor): add warning about profile persistence

[texhnolyze]

across reboots, as /etc/apparmor.d/containers will not be loaded, leading to the example nginx container not being able to start.

Description

Following the example to set up a custom apparmor profile.
I was suprised, that the profile suggested being located in /etc/apparmor.d/containers was not automatically loaded after a reboot.
This is because apparmor only loads files directly located in /etc/apparmor.d/* or known folder locations according to the Policy Layout.

This led to my container not being able to start with error:

Failed starting container: failed to create task for container: failed to create shim task: OCI runtime create failed: runc create failed: unable to start container process: error during container init: unable to apply apparmor profile: apparmor failed to apply profile: write /proc/thread-self/attr/apparmor/exec: no such file or directory: unknown

For this reason, I've added a warning section in the docs.

Reviews

• Technical review
• Editorial review
• Product review

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[github-actions]

Thanks for the PR. We'd like to make our product docs better, but haven't been able to review all the suggestions. As our docs change often and quickly diverge, we do not have the bandwidth to review and rebase old PRs.

If the updates are still relevant, please add a comment and review our contribution guidelines to rebase your PR against the latest version of the docs. This helps our maintainers focus on active contributions. If there's no activity, this PR will be closed in 30 days.

To remove the stale label: Comment /lifecycle active
To freeze (requires write access): Comment /lifecycle frozen

[github-actions]

Closing this PR as there hasn't been any activity for a long time.

If the updates are still relevant, please review our contribution guidelines and create a new PR against the latest version of our docs.