[feature] Make the NFS volumes accessible to the AWX worker pods

Move the `wp-nfs` volumeMount and volume from the `awx-task` container (where it is no longer used), to the `default` `InstanceGroup`'s pod template.

Author: Dominique Quatravaux

ansible/roles/awx-instance/tasks/awx-objects.yml

@@ -123,6 +123,34 @@
 
       update_json_status(changed=get_or_create_job_template(**kwarg))
 
+- name: "`default` InstanceGroup: provide /srv NFS volume to worker pods"
+  awx_script:
+    supports_check_mode: yes
+    script: |
+      {{ lookup("template", "awx_script_lib.py") }}
+      from awx.main.models.ha import InstanceGroup
+
+      # We *should not* create the InstanceGroup here - Rather, we
+      # want `-t awx.seed` to take care of that, so that it may put in
+      # all the required bells and whistles:
+      InstanceGroup.objects.get(name="default")
+
+      # Still, we want to use `AnsibleGetOrCreate` for its
+      # `supports_check_mode` goodness:
+      with AnsibleGetOrCreate(InstanceGroup, name="default") as grp:
+        grp.pod_spec_override = """
+      spec:
+        containers:
+          - name: worker
+            volumeMounts:
+            - name: wp-nfs
+              mountPath: "/srv"
+        volumes:
+          - name: wp-nfs
+            persistentVolumeClaim:
+              claimName: wordpress-0
+      """
+
 - name: "job template for backups"
   awx_script:
     supports_check_mode: yes

ansible/roles/awx-instance/tasks/k8s.yml

@@ -194,9 +194,6 @@
               readOnly: true
             - name: awx-redis-socket
               mountPath: "/var/run/redis"
-            - name: wp-nfs
-              mountPath: "/srv"
-              readOnly: true
             # For some reason, awx-task insists on being able to
             # constantly update /etc/receptor/receptor.conf, even
             # though we don't need that in Kubernetes. Oh well, at
@@ -258,9 +255,6 @@
           serviceAccountName: "{{ awx_service_account }}"
           terminationGracePeriodSeconds: 10
           volumes:
-          - name: wp-nfs
-            persistentVolumeClaim:
-              claimName: wordpress-0
           - name: awx-application-config
             configMap:
               name: awx-config