forgejo: Update runnerhost vm template with subdomain/hostname

Signed-off-by: David Kirwan <davidkirwanirl@gmail.com>

roles/openshift-apps/forgejo/defaults/main.yml

@@ -1,5 +1,8 @@
 ---
 forgejo_namespace: "forgejo"
+# KubeVirt headless Service name; must match spec.template.spec.subdomain and the
+# network.kubevirt.io/headlessService label (cluster DNS: <vm-name>.<name>.<ns>.svc.cluster.local).
+forgejo_runnerhost_headless_service_name: "forgejo-runnerhost"
 forgejo_project_description: "Forgejo Gitforge"
 forgejo_application_name: "{{ forgejo_namespace }}"
 

roles/openshift-apps/forgejo/tasks/create-forgejo-runnerhost-vm.yaml

@@ -1,4 +1,15 @@
 ---
+- name: Generate the forgejo-runnerhost-headless-service.yaml from template
+  ansible.builtin.template:
+    src: "forgejo-runnerhost-headless-service.yaml.j2"
+    dest: "/root/ocp4/openshift-apps/forgejo/forgejo-runnerhost-headless-service.yaml"
+    mode: "0770"
+
+- name: Deploy the forgejo-runnerhost headless Service
+  kubernetes.core.k8s:
+    state: present
+    src: "/root/ocp4/openshift-apps/forgejo/forgejo-runnerhost-headless-service.yaml"
+
 - name: Generate the forgejo-runnerhost-vm.yaml from template
   ansible.builtin.template:
     src: "forgejo-runnerhost-vm.yaml.j2"

roles/openshift-apps/forgejo/templates/forgejo-runnerhost-headless-service.yaml.j2

@@ -0,0 +1,18 @@
+---
+# Headless Service for KubeVirt VM pod DNS (subdomain + network.kubevirt.io/headlessService on the VM).
+# VirtualMachine FQDN: <vm-metadata.name>.{{ forgejo_runnerhost_headless_service_name }}.{{ forgejo_namespace }}.svc.cluster.local
+apiVersion: v1
+kind: Service
+metadata:
+  name: "{{ forgejo_runnerhost_headless_service_name }}"
+  namespace: {{ forgejo_namespace }}
+spec:
+  clusterIP: None
+  selector:
+    network.kubevirt.io/headlessService: "{{ forgejo_runnerhost_headless_service_name }}"
+  ports:
+    # Required by Service; not used for VM connectivity (masquerade handles traffic).
+    - name: placeholder
+      port: 15017
+      targetPort: 15017
+      protocol: TCP

roles/openshift-apps/forgejo/templates/forgejo-runnerhost-vm.yaml.j2

@@ -29,7 +29,7 @@ spec:
     metadata:
       creationTimestamp: null
       labels:
-        network.kubevirt.io/headlessService: headless
+        network.kubevirt.io/headlessService: "{{ forgejo_runnerhost_headless_service_name }}"
     spec:
       serviceAccountName: forgejo-runner-vm
       architecture: amd64
@@ -50,7 +50,7 @@ spec:
       networks:
       - name: default
         pod: {}
-      subdomain: headless
+      subdomain: "{{ forgejo_runnerhost_headless_service_name }}"
       volumes:
       - dataVolume:
           name: forgejo-runnerhost-vm-volume