ci: Add support for bootc end-to-end validation tests

[richm]

NOTE: This also requires upgrading to tox-lsr 3.10.0, and some
hacks to workaround a podman issue in ubuntu.

These tests run the role during a bootc container image build, deploy
the container into a QEMU VM, boot that, and validate the expected
configuration there. They run in two different tox environments, and
thus have to be run in two steps (preparation in buildah, validation in
QEMU). The preparation is expected to output a qcow2 image in
tests/tmp/TESTNAME/qcow2/disk.qcow2, i.e. the output structure of
https://github.com/osbuild/bootc-image-builder.

There are two possibilities:

• Have separate bootc end-to-end tests. These are tagged with
  tests::bootc-e2 and are skipped in the normal qemu-* scenarios.
  They run as part of the container-* ones.

• Modify an existing test: These need to build a qcow2 image exactly
  once (via calling bootc-buildah-qcow.sh) and skip setup/cleanup
  and role invocations in validation mode, i.e. when
  __bootc_validation is true.

In the container scenario, run the QEMU validation as a separate step in
the workflow.

See https://issues.redhat.com/browse/RHEL-88396

[sourcery-ai]

🧙 Sourcery has finished reviewing your pull request!

---

Tips and commands

Interacting with Sourcery

• Trigger a new review: Comment @sourcery-ai review on the pull request.
• Continue discussions: Reply directly to Sourcery's review comments.
• Generate a GitHub issue from a review comment: Ask Sourcery to create an
  issue from a review comment by replying to it. You can also reply to a
  review comment with @sourcery-ai issue to create an issue from it.
• Generate a pull request title: Write @sourcery-ai anywhere in the pull
  request title to generate a title at any time. You can also comment
  @sourcery-ai title on the pull request to (re-)generate the title at any time.
• Generate a pull request summary: Write @sourcery-ai summary anywhere in
  the pull request body to generate a PR summary at any time exactly where you
  want it. You can also comment @sourcery-ai summary on the pull request to
  (re-)generate the summary at any time.
• Generate reviewer's guide: Comment @sourcery-ai guide on the pull
  request to (re-)generate the reviewer's guide at any time.
• Resolve all Sourcery comments: Comment @sourcery-ai resolve on the
  pull request to resolve all Sourcery comments. Useful if you've already
  addressed all the comments and don't want to see them anymore.
• Dismiss all Sourcery reviews: Comment @sourcery-ai dismiss on the pull
  request to dismiss all existing Sourcery reviews. Especially useful if you
  want to start fresh with a new review - don't forget to comment
  @sourcery-ai review to trigger a new review!

Customizing Your Experience

Access your dashboard to:

• Enable or disable review features such as the Sourcery-generated pull request
  summary, the reviewer's guide, and others.
• Change the review language.
• Add, remove or edit custom review instructions.
• Adjust other review settings.

Getting Help

• Contact our support team for questions or feedback.
• Visit our documentation for detailed guides and information.
• Keep in touch with the Sourcery team by following us on X/Twitter, LinkedIn or GitHub.

[sourcery-ai]

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

• Consider centralizing the tox-lsr version into a shared variable or template to avoid repeating the bump in each workflow file.
• The Ubuntu podman pinning hack is quite involved—extracting it into a reusable action or dedicated job and clearly documenting its removal criteria might improve maintainability.
• Double-check that the skip-tags value (tests::bootc-e2e) matches the actual test tag (the description mentions tests::bootc-e2) to ensure no tests are unintentionally skipped.

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Review instructions: all looks good
• 🟢 Testing: all looks good
• 🟢 Documentation: all looks good

---

Sourcery is free for open source - if you like our reviews please consider sharing them ✨

• X
• Mastodon
• LinkedIn
• Facebook

_{Help me be more useful! Please click 👍 or 👎 on each comment and I'll use the feedback to improve your reviews.}