ci: Fix low-scale CI.

The low-scale CI scenario needed updating.

* It tried to use "localhost" as the host, which is no longer possible.
  The orchestrator and the ovn-tester container both need to be able to
  access the same hosts using the physical deployment file.
* It was missing a tester section.

.cirrus.yml

@@ -5,21 +5,23 @@ low_scale_task:
     image: family/fedora-cloud-35
     platform: linux
     memory: 8G
+    use_static_ip: true
 
   env:
     DEPENDENCIES: git ansible podman podman-docker
-    PHYS_DEPLOYMENT: ${CIRRUS_WORKING_DIR}/physical-deployments/localhost.yml
+    PHYS_DEPLOYMENT: ${CIRRUS_WORKING_DIR}/physical-deployments/ci.yml
 
   runtime_cache:
     folder: runtime-cache
 
   configure_ssh_script:
+    - export IP_ADDR=$(ip route get 8.8.8.8 | head -1 | sed 's/.*src \([0-9\.]*\).*/\1/')
     - mkdir -p /root/.ssh/
     - ssh-keygen -t rsa -N '' -q -f /root/.ssh/id_rsa
-    - ssh-keyscan localhost >> /root/.ssh/known_hosts
+    - ssh-keyscan ${IP_ADDR} >> /root/.ssh/known_hosts
     - cat /root/.ssh/id_rsa.pub >> /root/.ssh/authorized_keys
     - chmod og-wx /root/.ssh/authorized_keys
-    - ssh root@localhost -v echo Hello
+    - ssh root@${IP_ADDR} -v echo Hello
 
   install_dependencies_script:
     - dnf install -y ${DEPENDENCIES}
@@ -30,6 +32,8 @@ low_scale_task:
     - tar -xzf runtime-cache/runtime.tar.gz || true
 
   install_script:
+    - export IP_ADDR=$(ip route get 8.8.8.8 | head -1 | sed 's/.*src \([0-9\.]*\).*/\1/')
+    - 'sed -i "s/<ip>/${IP_ADDR}/g" ${PHYS_DEPLOYMENT}'
     - ./do.sh install
 
   pack_caches_script:

physical-deployments/ci.yml

@@ -0,0 +1,12 @@
+registry-node: <ip>
+internal-iface: eno1
+
+central-node:
+  name: <ip>
+
+tester-node:
+  name: <ip>
+  ssh_key: /root/.ssh/id_rsa
+
+worker-nodes:
+  - <ip>