Add image-mode testing

Provide a Containerfile to build the container to test iproute, and an
ad-hoc test plan for image-mode. Use testing-farm to test it.

Signed-off-by: Andrea Claudi <aclaudi@redhat.com>

plans/testing-farm-iproute.fmf

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+provision:
+  # nested virtualization supported runner required
+  hardware:
+    cpu:
+      processors: ">= 2"
+    memory: ">= 6 GB"
+    virtualization:
+      is-supported: true
+prepare:
+  - how: install
+    package:
+      - git
+      - podman
+      - skopeo
+      - tmt+provision-virtual
+      - tmt+provision-bootc
+  - how: shell
+    script: |
+      systemctl start libvirtd
+      systemctl status libvirtd
+environment:
+  TMT_VERBOSE: 1
+execute:
+  how: tmt
+discover:
+  how: fmf
+  test:
+    - /testing-farm
+finish:
+  how: shell
+  script:
+    # move all tmt plan logs to tmt plan data folder
+    - mkdir -p $TMT_PLAN_DATA/test-tmt-log
+    - cp -r /var/tmp/tmt/run-* $TMT_PLAN_DATA/test-tmt-log

plans/tier0-im.fmf

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+provision:
+  # use bootc plugin
+  # plugin configuration doc: https://tmt.readthedocs.io/en/stable/plugins/provision.html#bootc
+  how: bootc
+  container-file: /tests/Containerfile
+  container-file-workdir: .
+  disk: 20
+prepare:
+  - how: shell
+    script: |
+      rpm -q --whatprovides man || rpm-ostree install --apply-live --idempotent --allow-inactive --assumeyes man
+summary: Execute iproute Tier0 tests
+discover:
+    how: fmf
+    filter: 'tier: 0'
+    url: https://gitlab.cee.redhat.com/kernel-qe/networking/iproute.git
+execute:
+  how: tmt

tests/Containerfile

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+# Choose nightly base image from https://images.paas.redhat.com/repository/bootc/rhel-bootc?tab=tags
+FROM images.paas.redhat.com/bootc/rhel-bootc:latest-10.0
+
+# Add nightly compose repo into container image to install iproute
+RUN cat <<EOF >> /etc/yum.repos.d/rhel-10.repo
+[rhel10-baseos]
+name=rhel10-baseos
+baseurl=http://download-node-02.eng.bos.redhat.com/rhel-10/nightly/RHEL-10/latest-RHEL-10.0/compose/BaseOS/\$basearch/os/
+enabled=1
+gpgcheck=0
+repo_gpgcheck=0
+
+[rhel10-appstream]
+name=rhel10-appstream
+baseurl=http://download-node-02.eng.bos.redhat.com/rhel-10/nightly/RHEL-10/latest-RHEL-10.0/compose/AppStream/\$basearch/os/
+enabled=1
+gpgcheck=0
+repo_gpgcheck=0
+
+[epel10]
+name=epel10
+baseurl=https://dl.fedoraproject.org/pub/epel/10/Everything/\$basearch/
+enabled=1
+gpgcheck=0
+repo_gpgcheck=0
+EOF
+
+# Install packages from nightly compose
+RUN dnf -y install iproute && \
+    dnf clean all

tests/testing-farm.fmf

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+summary: Deploy testing farm runner to run iproute tmt test
+test: cd .. && tmt run -vvvvv plans --name /plans/tier0-im
+duration: 20m