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

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

Signed-off-by: Rich Megginson <rmeggins@redhat.com>

contributing.md

@@ -70,3 +70,51 @@ ansible-playbook --skip-tags tests::cleanup \
 
 [NM 1.0](https://lazka.github.io/pgi-docs/#NM-1.0), it contains a full
 explanation about the NetworkManager API.
+
+### Integration tests with podman
+
+1. Create `~/.ansible/collections/ansible_collections/containers/podman/` if this
+  directory does not exist and `cd` into this directory.
+
+    ```bash
+    mkdir -p ~/.ansible/collections/ansible_collections/containers/podman/
+    cd ~/.ansible/collections/ansible_collections/containers/podman/
+    ```
+
+2. Clone the collection plugins for Ansible-Podman into the current directory.
+
+    ```bash
+    git clone https://github.com/containers/ansible-podman-collections.git .
+    ```
+
+3. Change directory into the `tests` subdirectory.
+
+    ```bash
+    cd ~/network/tests
+    ```
+
+4. Use podman with `-d` to run in the background (daemon). Use `c7` because
+  `centos/systemd` is centos7.
+
+    ```bash
+    podman run --name lsr-ci-c7 --rm --privileged \
+    -v /sys/fs/cgroup:/sys/fs/cgroup:ro \
+    -d registry.centos.org/centos/systemd
+    ```
+
+5. Use `podman unshare` first to run "podman mount" in root mode, use `-vi` to
+  run ansible as inventory in verbose mode, use `-c podman` to use the podman
+  connection plugin. NOTE: Some of the tests do not work with podman - see
+  `.github/run_test.sh` for the list of tests that do not work.
+
+    ```bash
+    podman unshare
+    ansible-playbook -vi lsr-ci-c7, -c podman tests_provider_nm.yml
+    ```
+
+6. NOTE that this leaves the container running in the background, to kill it:
+
+    ```bash
+    podman stop lsr-ci-c7
+    podman rm lsr-ci-c7
+    ```