revise to use Arcus staging pull-through cache

Author: sjpb

environments/.stackhpc/hooks/pre.yml

@@ -19,26 +19,13 @@
 - hosts: all:!builder
   become: yes
   gather_facts: false
-  name: Use local container image registry to avoid docker.io ratelimits
   tasks:
-    - name: Copy registries.conf
+    - name: Configure Azimuth staging pullthrough container image registry to avoid docker.io ratelimits
       copy:
-        remote_src: true
-        src: /etc/containers/registries.conf
-        dest: /etc/containers/registries.conf.orig
-    - name: Define local registry
-      tags: podman
-      blockinfile:
-        path: /etc/containers/registries.conf
-        block: |
+        dest: /etc/containers/registries.conf.d/003-arcus-unqualfied-overrides.conf
+        content: |
+          unqualified-search-registries = ['{{ podman_registry_address }}', 'registry.access.redhat.com', 'registry.redhat.io', 'docker.io']
+
           [[registry]]
-          prefix = "192.168.3.95:5000"
-          location = "192.168.3.95:5000"
-          insecure = true
-    - name: Use local registry for unqualified searches
-      tags: podman
-      community.general.ini_file: # actually TOML but this is OK here
-        path: /etc/containers/registries.conf
-        section: null
-        option: unqualified-search-registries
-        value: ['192.168.3.95:5000', 'registry.access.redhat.com', 'registry.redhat.io', 'docker.io']
+          prefix = "{{ podman_registry_address }}"
+          location = "{{ podman_registry_address }}"

environments/.stackhpc/inventory/group_vars/all/podman.yml

@@ -0,0 +1,2 @@
+arcus_podman_registry_address: registry.apps.128-232-222-81.sslip.io/v2/dockerhub-public
+podman_registry_address: "{{ arcus_podman_registry_address if ci_cloud == 'ARCUS' else '' }}"