test container: Add DAC_READ_SEARCH capability

[rjeffman]

SSSD 2.10+ runs under non-privileged user 'sssd' and relies on system capabilities to get access to certain resources like /etc/krb5.keytab. Not having these capabilities result in SSSD not starting.

Podman has reduced the capabilities granted to containers, and to be able to start SSSD it is needed to add DAC_READ_SEARCH back.

See: containers/podman#24904 (comment)

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request adds the DAC_READ_SEARCH capability to the test container. This is required for SSSD 2.10+ to run in the container due to reduced default capabilities in recent Podman versions. Without this capability, SSSD fails to start because it cannot access resources like /etc/krb5.keytab.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Added the DAC_READ_SEARCH capability to the test container.	Added DAC_READ_SEARCH to the container capabilities.	infra/image/shcontainer

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[sourcery-ai]

Hey @rjeffman - I've reviewed your changes - here's some feedback:

Overall Comments:

• Consider adding a comment in the code explaining why this capability is needed.

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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[t-woerner]

LGTM